α-unsaturated amines, their production and use

ABSTRACT

alpha -Unsaturated amines of the formula: wherein X1 and X2 are such that one is an electron-attracting group with the other being a hydrogen atom or an electron-attracting group; R1 is a group attached through a nitrogen atom; R2 is a hydrogen atom or a group attached through a carbon, nitrogen or oxygen atom; n is an integer equal to 0, 1 or 2; A is a heterocyclic group or a cyclic hydrocarbon group, and salts thereof and their agrochemical use as insecticidal and/or miticidal agents are described.

This application is a divisional of application Ser. No. 08/957,749,filed Oct. 24, 1997 now U.S. Pat. No. 5,935,981 now which is in turn adivisional of application Ser. No. 07/225,367, filed Jul. 28, 1988 nowU.S. Pat. No. 5,849,768.

This invention relates to agrochemically useful α-unsaturated amineshaving insecticidal/miticidal activity, their production and use.

Among α-unsaturated amines, such compounds as (i) cimetidine (describedfor example in Journal of Medicinal Chemistry 24, 913, 1981),(ii)ranitidine (described for example in Agents Actions 11, 160, 1981) and(iii) famotidine (described for example in Journal of MedicinalChemistry 27, 849, 1984)are known as histamine H₂ receptor antagonists.##STR2##

As agricultural insecticide/miticides, organo-phosphorus or carbamatepesticides which are highly toxic to warm-blooded animals haveheretofore been employed. However, there has been an emergence ofnoxious insects, particularly of the order "Hemiptera", which areresistant to these pesticides, and there has been a long-standing needfor the development of a pesticide effective against these resistantpests.

Getting impetus from the aforementioned histamine H₂ receptorantagonists, the present inventors synthesized various α-unsaturatedamines and investigated their activities. As a result, we discoveredsurprisingly that compounds of the invention which have no alkylenegroup or only a short alkylene group in the side chain haveagriculturally useful insecticidal/miticidal activity.

Based on the above finding, the present inventors conducted furtherresearch and have come up with the present invention.

The invention is, thus, concerned with:

(1) novel α-unsaturated amines of the formula: ##STR3## wherein X¹ andX² are such that one is an electron-attracting group with the otherbeing a hydrogen atom or an electron-attracting group; R¹ is a groupattached through a nitrogen atom; R² is a hydrogen atom or a groupattached through a carbon, nitrogen or oxygen atom; n is an integerequal to 0, 1 or 2; A° is a heterocyclic group, with the proviso thatwhen R² is a hydrogen atom, R¹ is a group of the formula: ##STR4##wherein R^(3a) is a hydrogen atom, C₁₋₄ alkyl, C₇₋₉ aralkyl or C₁₋₄ acyland R^(4a) is a hydrogen atom, C₁₋₄ alkyl, C₁₋₄ alkoxy-C₁₋₄ alkyl,(di-C₁₋₄ alkylainino)-C₁₋₄ alkyl, tri-C₁₋₄ alkylsiolyl-C₁₋₄ alkyl, C₂₋₄alkenyl, or pyridylor thiazolyl-C₁₋₂ alkyl wherein the pyridyl orthiazolyl moiety may optionally be substituted with a halogen atom, orR^(3a) and R^(4a) taken together with the adjacent nitrogen atomconstitute pyrrolidino and A° is pyridyl, pyrazinyl or thiazolyl whichmay optionally be substituted with a halogen C₁₋₄ alkyl, C₁₋₄ alkylthioor C₁₋₄ alkoxy, , or a salt thereof, and

(2) insecticidal/pesticidal compositions containing an α-unsaturatedamine of the formula: ##STR5## wherein X¹ and X² are such that one is anelectron-attracting group with the other being a hydrogen atom or anelectron-attracting group; R¹ is a group attached through a nitrogenatom; R² is a hydrogen atom or a group attached through a carbon,nitrogen or oxygen atom; n is an integer equal to 0, 1 or 2; A is aheterocyclic group or a cyclic hydrocarbon group, with the proviso thatwhen R¹ is β-N-pyrrolidinoethylamino and R² is a hydrogen atom, A is agroup of the formula: ##STR6## Hal is a halogen atom (e.g. Cl, Br, F,etc.), or a salt thereof, and their production.

Referring to the above formulas [I°] and [I], one of X¹ and X² is anelectron-attracting group with the other being a hydrogen atom or anelectron-attracting group. The electron-attracting group represented byX¹ and X² includes, among others, cyano, nitro, C₁₋₄ alkoxy-carbonyl(e.g. methoxycarbonyl, ethoxycarbonyl, etc.), hvdroxycarbonyl, C₆₋₁₀aryloxy-carbonyl (e.g. phenoxycarbonyl etc.), heterocycleoxycarbonylwherein the heterocycle moiety is as mentioned below (e.g.pyridyloxycarbonyl, thienyloxycarbonyl, etc.), C₁₋₄ alkylsulfonyl whichmay be substituted with halogen (e.g. methylsulofonyl,trifluoromethylsulfonyl, ethylsulfonyl, etc.), aminosulfonyl, di-C₁₋₄alkoxyphosphoryl (e.g. diethoxyphosphoryl, etc.), C₁₋₄ acyl which may besubstituted with halogen (e.g. a C₁₋₄ alkylcarbonyl such as acetyl,trichloroacetyl, trifluoroacetyl, etc.), C₁₋₄ alkylsulfonylthiocarbamoyl(e.g. methylsulfonylthiocarbamoyl, etc.), carbamoyl and so on. One of X¹and X² may be a halogen atom such as fluorine, chlorine, bromine oriodine, and X¹ and X² may join together with the adjacent carbon atom toform a ring such as, for example, ##STR7## Preferred examples of thegroup ##STR8##

Referring to the above formulas [I°] and [I], R¹ may be a group attachedthrough a carbon, oxygen or sulfur atom, but a group attached through anitrogen atom is preferred. Thus, for example, a group of the formula##STR9## can be used. In the above formula, R³ is for example a hydrogenatom, an alkyl group (for example, a C₁₋₆ alkyl groups such as methyl,ethyl, n-propyl, i-propyl, n-butyl, i-butyl, n-hexyl, etc.), an C₆₋₁₀aryl group (for example, phenyl, etc.), an C₇₋₉ aralkyl group (forexample a phenylalkyl such as benzyl, etc.), a heterocyclic group asmentioned below (for example, pyridyl, etc.), a C₁₋₄ acyl group (forexample, formyl, acetyl, propionyl, etc.), a C₆₋₁₀ arylcarbonyl (forexample, benzoyl, etc.), an alkoxycarbonyl group (for example, C₁₋₄alkoxycarbonyl groups such as methoxycarbonyl, ethoxycarbonyl, etc.), aC₆₋₁₀ aryloxy-carbonyl group (for example, phenoxycarbonyl, etc.), aheterocycleoxycarbonyl group wherein the heterocycle moiety is asmentioned below (for example, furyloxycarbonyl, etc.), a C₆₋₁₀arylsulfonyl group (for example, phenylsulfonyl, etc.), an alkylsulfonylgroup (for example, C₁₋₄ alkylsulfonyl groups such as methylsulfonyl,etc.), a dialkoxyphosphoryl group (for example, di-C₁₋₄ alkoxyphosphorylgroups such as diethoxyphosphoryl, etc.), an alkoxy group (for example,C₁₋₄ alkoxy groups such as methoxy, ethoxy, etc.), a hydroxy group, anamino group, a dialkylamino group (for example, di-C₁₋₄ alkylamino groupsuch as dimethylamino, diethylamino, etc.), an acylamino group (forexample, C₁₋₄ acylamino groups such as formylamino, acetylamino,propionylamino, etc.), an alkoxycarbonylamino groups (for example, C₁₋₄alkoxy-carbonylamino groups such as methoxycarbonylamino, etc.), analkylsulfonylamino group (for example, C₁₋₄ alkylsulfonylamino groupssuch as methylsulfonylamino, etc.), a di-alkoxyphosphoroylamino group(for example, di-C₁₋₄ alkoxyphosphorylamino groups such asdiethoxy-phosphorylamino, etc.), an C₇₋₉ aralkyloxy group (for example,benzyloxy, etc.), an alkoxycarbonylalkyl group (for example, C₁₋₄alkoxy-carbonyl-C₁₋₄ alkyl groups such as methoxycarbonylmethyl, etc.)or the like. R⁴ is for example a hydrogen atom, or an alkyl (forexample, C₁₋₄ alkyl groups such as methyl, ethyl, etc.), cycloalkyl (forexample, C₃₋₆ cycloalkyl groups such as cyclohexyl, etc.), alkenyl (forexample, C₂₋₄ alkenyl groups such as vinyl, allyl, etc.), cycloalkenyl(e.g. C₃₋₆ cycloalkenyl groups such as cyclohexenyl, etc.) or alkynyl(for example, C₂₋₄ alkynyl groups such as ethynyl, etc.) group which mayoptionally be substituted by 1 to 3 substituents (e.g. hydroxyl, C₁₋₄alkoxy such as methoxy, halogen such as fluorine, di-C₁₋₄ alkylaminosuch as dimethylamino, C₁₋₄ alkylthio such as i-propylthio andn-propylthio, C₁₋₃ acylamino such as acetylamino, C₁₋₄alkylsulfonyolamino such as methylsulfonylamino, tri-C₁₋₄ alkylsilylsuch as trimethylsilyl, pyridyl or thiazolyl which may optionally besubstituted with a halogen atom, etc.). Furthermore, R³ and R⁴ may,taken together with the adjacent nitrogen atom, constitute a 5- or6-membered cyclic amino group such as ##STR10##

The group attached through a nitrogen atom, represented by R¹, includesan amino group which may optionally be substituted (for example by anyof the alkyl, aryl, aralkyl, heterocyclic, acyl, alkoxycarbonyl,aryloxycarbonyl, heterocycleoxycarbonyl, arylsulfonyl, alkylsulfonyl,dialkoxyphosphoryl, cycloalkyl, alkenyl, cycloalkenyl and alkynyl groupsmentioned in the above definition of R³ and R⁴) such as di-substitutedamino groups, e.g. di-C₁₋₆ alkylamino, N-C₁₋₆ alkyl-N-formylamino, etc.,mono-substituted amino groups, e.g. mono-C₁₋₆ alkylamino etc., andunsubstituted amino, a hydrazino group which may optionally besubstituted (for example by any of the alkyl, acyl, alkoxycarbonyl,alkylsulfonyl, dialkoxyphosphoryl and other groups mentioned in theabove definition of R³) or a hydroxyamino group which may optionally besubstituted (for example by any of the alkyl, aralkyl and other groupsmentioned in the above description of R³).

R² is a hydrogen atom or a group attached through a carbon, nitrogen oroxygen atom. The group attached through a carbon atom, R², includes,among others, C₁₋₄ acyl (for example, formyl, acetyl, propionyl, etc.),alkyl (for example, C₁₋₄ alkyl groups such as methyl, ethyl, n-propyl,i-propyl, n-butyl, i-butyl, sec-butyl, etc.), alkenyl (for example, C₂₋₄alkenyl groups such as vinyl, allyl, etc.), cycloalkyl (for example,C₃₋₆ cycloalkyl groups such as cyclopentyl, cyclohexyl, etc.), C₆₋₁₀aryl (for example, phenyl, naphthyl, etc.), C₇₋₉ aralkyl (for examplephenylalkyl such as benzyl, etc.) and heterocyclic as mentioned belowwhich has a free bond on a carbon atom thereof (for example, 3- or4-pyridyl, etc.). These groups may each be substituted by 1 to 3substituents (for example, C₁₋₄ alkylthio groups such as methylthio,ethylthio, etc., C₁₋₄ alkoxy groups such as methoxy, ethoxy, etc., mono-or di-C₁₋₄ alkylamino groups such as methylamino, dimethylamino, etc.,C₁₋₄ alkoxy-carbonyl groups such as methoxycarbonyl, ethoxycarbonyl,etc., C₁₋₄ alkylsulfonyl groups such as methylsulfonyl, ethylsulfonyl,etc., halogen atoms such as fluorine, chlorine, bromine iodine, etc.,C₁₋₄ acyl groups including alkanoyls such as acetyl, etc., benzoyl,phenylsulfonyl, pyridyl and so on). The group attached through anitrogen atom, R², includes, among others, the groups mentioned in thedefinition of R¹. The group attached through an oxygen atom, R²,includes, among others, alkoxy (for example, C₁₋₄ alkoxy groups such asmethoxy, ethoxy, etc.), cycloalkoxy (for example, C₃₋₆ cycloalkoxygroups such as cyclohexyloxy etc.), alkenyloxy (for example, C₂₋₄alkenyloxy groups such as vinyloxy, allyloxy, etc.), cycloalkenyloxy(for example, C₃₋₆ cycloalkenyloxy groups such as cyclohexenyloxy etc.),alkynyloxy (for example, ethynyloxy etc.), C₆₋₁₀ aryloxy (for example,phenoxy, etc.), heterocycleoxy wherein the heterocycle moiety is asmentioned below (for example, thienyloxy etc.) and hydroxyl. Thesegroups may each have 1 to 3 substituents (for example, halogen such asfluorine, chlorine, bromine, phenyl and so on). R² is preferably a groupattached through a carbon, nitrogen or oxygen group, such as formyl, analkyl group (particularly C₁₋₄ alkyl groups such as methyl, ethyl, etc.)which may optionally be substituted (for example by the C₁₋₄ alkylthio,C₁₋₄ alkoxy, mono- or di-C₁₋₄ alkylamino, C₁₋₄ alkoxycarbonyl, C₁₋₄alkylsulfonyl, acetyl, benzoyl, phenylsulfonyl, pyridyl, etc.), an aminogroup- which may optionally be substituted (for example, those mentionedin the definition of R¹) and a hydroxyl group which may optionally besubstituted) for example by the above-mentioned C₁₋₄ alkyl, C₃₋₆cycloalkyl, C₂₋₄ alkenyl, C₃₋₆ cycloalkenyl, C₂₋₄ alkynyl, C₆₋₁₀ aryland heterocyclic groups (particularly C₁₋₄ alkoxy groups such as methoxyand so on). The symbol n means 0, 1 or 2. Therefore, --C_(n) H_(2n) --in the formulas [I°] and [I] represents a single bond, --CH₂ --,##STR11## although the single bond or --CH₂ -- is preferred. The symbolsA° and A mean a heterocyclic group as mentioned below (such as3-pyridyl, 6-chloro-3-pyridyl, 6-methoxy-3-pyridyl, 6-methyl-3-pyridyl,3-quinolyl, etc.), preferably one which may optionally be substitutedwith one to three of the choices (i), (iv), (Viii), (XVii), (XLVi),(XLViii) and so on as mentioned below, or a cyclic hydrocarbon group asmentioned below (such as cyclopropyl, cyclohexyl, phenyl, p-chlorophenyland so on), preferably one which may optionally be substituted with oneor two of the choice (XVii) as mentioned below, The heterocyclic groupof A° or A is more preferably a pyridyl or thiazolyl group which mayoptionally be substituted, such as 3-pyridyl,6-chloro-3-pyridyl,6-brono-3-pyridyl, 2-chloro-5-thiazolyl and so on.The cyclic hydrocarbon group A is more preferably a halophenyl groupsuch as p-chlorophenyl and so on.

As the alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, aryl, aralkyl,heterocyclic and cyclic hydrocarbon groups in the definitions of X¹, X²,R¹, R², R³, R⁴, A° and A, the following groups, among others, may beemployed and each of these groups may have 1 to 5 substituents such as(i) through (Lii) which appear hereinafter.

The alkyl group preferably contains 1 to 20 carbon atoms and is morepreferably a group of 1 to 8 carbon atoms. This alkyl group may bestraight-chain or branched. Specific examples of the alkyl group includemethyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl,tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, 2-ethylhexyl, decyl,undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl,octadecyl, nonadecyl, eicosyl and so on.

The cycloalkyl group is preferably a group of 3 to 6 carbon atoms, suchas cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and so on.

The alkenyl group is preferably a group of 2 to 6 carbon atoms. Specificexamples of such alkenyl group include vinyl, allyl, isopropenyl,methallyl, 1,1-dimethylallyl, 2-butenyl, 3-butenyl, 2-pentenyl,4-pentenyl, 5-hexenyl and so on.

The cycloalkenyl group is preferably a group of 3 to 6 carbon atoms,such as 1-cyclopropenyl, 2-cyclopropenyl, 1-cyclobutenyl,2-cyclobutenyl, 1-cyclopentenyl, 2-cyclopentenyl, 3-cyclopentenyl,1-cyclohexenyl, 2-cyclohexenyl, 3-cyclohexenyl, 1,3-cyclohexadien-1-yl,1,4-cyclohexadien-1-yl, 1,3-cyclopentadien-1-yl, 2,4-cyclopentadien-1-yland so on.

The alkynyl group is preferably a group of 2 to 6 carbon atoms, such asethynyl, propargyl, 2-butyn-1-yl, 3-butyn-1-yl, 3-butyn-2-yl,1-pentyn-3-yl, 3-pentyn-1-yl, 4-pentyn-2-yl, 3-hexyn-1-yl and so on.

The aryl group may for example be phenyl or naphthyl.

The aralkyl group may for example be benzyl, phenethyl, naphthylmethylor the like.

The heterocyclic group includes, among others, 5- to 8-membered ringseach containing 1 to 5 hetero atoms such as oxygen, sulfur and nitrogenor fused rings derived therefrom, such as 2- or 3- thienyl, 2- or 3-furyl, 2- or 3- pyrrolyl, 2-, 3- or 4- pyridyl, 2-, 4- or 5- oxazolyl,2-, 4- or 5- thiazolyl, 3-, 4- or 5- pyrazolyl, 2-, 4- or 5- imidazolyl,3-, 4- or 5- isoxazolyl, 3-, 4- or 5- isothlazolyl, 3- or 5-(1,2,4-oxadiazolyl), 1,3,4-oxadiazolyl, 3- or 5-(1,2,4-thiadiazolyl),1,3,4-thiadiazolyl, 4- or 5-(1,2,3-thiadiazolyl), 1,2,5-thiadiazolyl,1,2,3-triazolyl, 1,2,4-triazolyl, 1H- or 2H tetrazolyl, N-oxido- 2-, 3-or 4- pyridyl, 2-, 4- or 5-pyrimidinyl, N-oxido-2-, 4- or 5-pyrimidinyl, 3- or 4-pyridazinyl, pyrazinyl, N-oxido-3- or4-pyridazinyl, benzofuryl, benzothiazolyl, benzoxazolyl, triazinyl,oxotriazinyl, tetrazolo[1,5-b]pyridazinyl, triazolo[4,5-b]pyridazinyl,oxoimidazinyl, dioxotriazinyl, pyrrolidinyl, piperidionyl, pyranyl,thiopyranyl, 1,4-oxazinyl, morpholinyl, 1,4-thiazinyl, 1,3-thiazinyl,piperazinyl, benzimidazolyl, quinolyl, isoquinolyl, cinnolinyl,phthalazinyl, quinazolinyl, quinoxalinyl, indolizinyl, quinolizinyl,1,8-naphthyridinyl, purinyl, pteridinyl, dibenzofuranyl, carbazolyl,acridinyl, phenanthridinyl, phenazinyl, phenothiazinyl, phenoxazinyl andso on.

The cyclic hydrocarbon group includes, among others, C₃₋₆ cycloalkylgroups such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.,C₃₋₆ cycloalkenyl groups such as 1-cyclopropenyl, 2-cyclobutenyl,1-cyclohexenyl, 2-cyclohexenyl, 1,3-cyclohexadien-1-yl, etc., and C₆₋₁₀aryl groups such as phenyl, naphthyl and so on.

(i) C₁₋₄ Alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl,isobutyl, sec-butyl, tert-butyl, etc. are used.

(ii) C₃₋₆ Cycloalkyl groups such as cyclopropyl, cyclobutyl,cyclopentyl, cyclohexyl, etc. are used.

(iii) C₆₋₁₀ Aryl groups such as phenyl, naphthyl, etc. are used.

(iv) C₁₋₄ Alkoxy groups such as methoxy, ethoxy, propoxy, isopropoxy,butoxy, tert-butoxy, etc. are used.

(v) C₃₋₆ Cycloalkyloxy groups such as cycloproopyloxy, cyclopentyloxy,cyclohexyloxy, etc. are used.

(vi) C₆₋₁₀ Aryloxy groups such as phenoxy, naphthyloxy, etc. are used.

(vii) C₇₋₁₂ Aralkyloxy groups such as benzyloxy, 2-phenethyloxy,1-phenethyloxy, etc. are used.

(viii) C1-4 Alkylthio groups such as methylthio, ethylthio, propylthio,butylthio, etc. are used.

(ix) C₃₋₆ Cycloalkylthio groups such as cyclopropylthio,cyclopentylthio, cyclohexylthio, etc. are used.

(x) C₆₋₁₀ Arylthio groups such as phenylthio, naphthylthio, etc. areused.

(xi) C₇₋₁₂ Aralkylthio groups such as benzylthio, 2-phenethylthio,1-phenethylthio, etc. are used.

(xii) Mono-C₁₋₄ alkylamino groups such as methylamino, ethylamino,propylamino, isopropylamino, butylamino, isobutylamino,tert-butylaminio, etc. are used.

(xiii) Di-C₁₋₄ alkylamino groups such as dimethylamino, diethylamino,dipropylamino, dibutylamino, N-methyl-N-ethylamino,N-methyl-N-propylamino, N-methyl-N-butyl-amino, etc. are used.

(xiv) C₃₋₆ Cycloalkylamino groups such as cyclopropylamino,cyclopentylamino, cyclohexylamino, etc. are used.

(xv) C₆₋₁₀ Arylamino groups such as anilino etc. are used.

(xvi) C₇₋₁₂ Aralkylamino groups such as benzylamino, 2-phenethylamino,1-phenethylamino, etc. are used.

(xvii) Halogen atoms such as fluorine, chlorine, bromine and iodine areused.

(xviii) C₁₋₄ Alkoxycarbonyl groups such as methoxycarbonyl,ethoxycarbonyl, propoxycarbonyl, isopropoxycarboyl, butoxycarbonyl,tert-butoxycarbonyl, isobutoxycarbonyl, etc. are used.

(xix) C₆₋₁₀ Aryloxycarbonyl groups such as phenoxycarbonyl etc. areused.

(xx) C₃₋₆ Cycloalkyloxycarbonyl groups such as cyclopropyloxycarbonyl,cyclopentyloxycarbonyl, cyclohexyloxycarbonyl, etc. are used.

(xxi) C₇₋₁₂ Aralkyloxycarbonyl groups such as benzyloxycarbonyl,1-phenethyloxycarbonyl, 2-phenethyloxycarbonyl, etc. are used.

(xxii) C₁₋₅ Alkanoyl groups such as formyl, acetyl, propionyl, butyryl,pivaloyl, etc. are used.

(xiii) C₁₋₁₅ Alkanoyloxy groups such as formyloxy, acetoxy, butyryloxy,pivaloyloxy, pentanoyloxy, hexanoyloxy, heptanoyloxy, octanoyloxy,nonanoyloxy, decanoyloxy, undecanoyloxy, dodecanoyloxy, tridecanoyloxy,tetradecanoyloxy, pentadecanoyloxy, etc. are used.

(xxiv) Carbamoyl groups which may optionally be substituted, such ascarboaomoyl, N-methylcarbamoyl, N,N-dimethylcarbamoyl,N-ethylcarboamoyl, N,N-diethylcarbamoyl, N-phenylcarboaomoyl,pyrrolidinocarbamoyl, piperidinocarbamoyl, piperazinocarbamoyl,morpholinocarbamoyl, N-benzylcarbamoyl, etc. are used.

(xxv) Substituted carbamoyloxy groups such as N-methylcarbamoyloxy,N,N-dimethylcarbamoyloxy, N-ethylcarbamoyloxy, N-benzylcarbamoyloxy,N,N-dibenzylcarboaomoyloxy, N-phenylcarbamoyloxy, etc. are used.

(xxvi) C₁₋₄ Alkanoylamino groups such as formylamino, acetamido,propionamide, butyramido, etc. are used.

(xxvii) C₆₋₁₀ Arylcarbonylamino groups such as benzamido etc. are used.

(xxviii) C₁₋₄ Alkoxycarbonylamino groups such as methoxycarbonylamino,ethoxycarbonylamino, butoxycarbonylamino, tert-butoxycarbonylamino, etc.are used.

(xxix) C₇₋₁₂ Aralkyloxycarbonylamino groups such asbenzyloxycarbonylamino, 4-methoxybenzyloxycarbonylamino,4-nitrobenzyloxycarbonylamino, 4-chlorobenzyloxycarbonylamino, etc. areused.

(xxx) Substituted sulfonylamino groups such as methanesulfonylamino,ethanesulfonylamino, butanesulfonylamino, benzensulfonylamino,toluenesulfonylamino, naphthalenesulfonylamino,trifluoromethanesulfonylamino, 2-chloroethanesulfonylamino,2,2,2-trifluoromethanesulfonylamino, etc. are used.

(xxxi) Heterocyclic groups nuclearly containing 1 to 5 hetero atoms ofN, O and/or S, such as pyrrolidinyl, pyrrolyl, pyrazolyl, imidazolyl,furyl, thienyl, oxazolyl, isoxazolyl, isothiazolyl, thiazolyl,piperidinyl, pyridyl, piperazinyl, pyrimidinyl, pyranyl,tetrahydropyranyl, tetrahydrofuryl, indolyl, quinolyl,1,3,4-oxadiazolyl, thieno[2,3-d]pyridyl, 1,2,3-thiadiazolyl,1,3,4-thladiazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,3,4-triazolyl,tetrazolyl, 4,5-dihydro-1,3-dioxazolyl, tetrazolo[1,5-b]pyridazinyl,benzothiazolyl, benzoxazolyl, benzimidazolyl, benzothienyl, etc. areused.

(xxxii) Heterocyclethio, heterocycleoxy, heterocycleamino, andheterocyclecarbonylamino groups and groups derived therefrom byattachment of any of heterocyclic groups

(xxxi) to the S, O, N atom or the carbonylamino group are used.

(xxxiii) Di-C₁₋₄ alkylphosphinothioylamino groups such asdimethylphosphinothioylamino, diethylphosphinothioylamino, etc. areused.

(xxxiv) Alkoxyimino groups such as methoxyimino, ethoxyimino,2-fluoroethoxyimino, carboxymethoxyimino, 1-carboxy-1-methylethoxyimino,2,2,2-trichloroethoxycarbonylmethoxyimino,1-(2,2,2-trichloroethoxycarbonyl)-1-methylethoxyimino,(2-aminothiazol-4-yl)methoxyimino, (1H-imidazol-4-yl)methoxyimino, etc.are used.

(xxxy) C₁₋₄ Alkylsulfonyloxy groups such as methanesulfonyloxy,ethanesulfonyloxy, butanesulfonyloxy, etc. are used.

(xxxvi) C₆₋₁₀ Arylsulfonyloxy groups such as benzenesulfonyloxy,toluenesulfonyloxy, etc. are used.

(xxxvii) Di-C₆₋₁₀ arylphosphinothioylamino groups such asdiphenylphosphinothioylamino, etc. are used.

(xxxviii) Thiocarbamoylthio groups which may optionally be substituted,such as thiocarbamoylthio, N-methylthiocarbamoylthio,N,N-dimethylthiocarbamoylthio, N-ethylthiocarbamoylthio,N-benzylthiocarbamoylthio, N,N-dibenzylthiocarbanoylthio,N-phenylthiocarbamoylthio, etc. are used.

(xxxix) Silyloxy groups such as trimethylsilyloxy,t-butyldimethylsilyloxy, t-butyldiphenylsilyloxy,dimethylphenylsilyloxy, etc. are used.

(xL) Silyl groups such as trimethylsilyl, t-butyldimethylsilyl,t-butyldiphenylsilyl, dimethylphenylsilyl, etc. are used.

(xLi) C₁₋₄ Alkylsulfinyl groups such as methylsulfinyl, ethylsulfinyl,propylsulfinyl, butylsulfinyl, etc. are used.

(xLii) C₆₋₁₀ Arylsulfinyl groups such as phenylsulfinyl,naphthylsulfinyl, etc. are used.

(xLiii) C₁₋₄ Alkylsulfonyl groups such as methanesulfonyl,ethanesulfonyl, butanesulfonyl, etc. are used.

(xLiv) C₆₋₁₀ Arylsulfonyl groups such as benzenesulfonyl,toluenesulfonyl, etc. are used.

(xLv) C₁₋₄ Alkoxycarbonyloxy groups such as methoxycarbonyloxy,ethoxycarbonyloxy, tert-butoxycarbonyloxy, etc. are used.

(xLvi) Halo-C₁₋₄ alkyl groups such as trifluoromethyl,1,1,2,2-tetrafluoroethyl, difluoromethyl, monofluoromethyl,trichloromethyl, dichloromethyl, monochloromethyl, etc. are used.

(xLvii) Halo-C₁₋₄ alkoxy, halo-C₁₋₄ alkylthio, halo-C₁₋₄ alkylsulfinyland halo-C₁₋₄ alkylsulfonyl groups as well as groups derived therefromby attachement of any of halo-C₁₋₄ alkyl groups (xLvi) to the O, S,sulfinyl and sulfonyl moieties thereof are used.

(xLviii) Cyano, nitro, hydroxy, carboxyl, sulfo and phosphono groups areused.

(xLix) C₁₋₄ Alkyloxysulfonyl groups such as methoxysulfonyl,ethoxysulfonyl, butoxysulfonyl, etc. are used.

(L) C₆₋₁₀ Aryloxysulfonyl groups such as phenoxysulfonyl,tolyloxysulfonyl, etc. are used.

(Li) C₇₋₁₂ Aralkyloxysulfonyl groups such as benzyloxysulfonyl,2-phenethyloxysulfonyl, 1-phenethyloxysulfonyl, etc. are used.

(Lii) Di-C₁₋₄ -alkyloxyphosphoryl groups such as dimethoxyphosphoryl,diethoxyphosphoryl, dibutoxyohosohoryl, etc. are used.

Preferred examples of the unsaturated amines of formulas [I°] and [I] orsalts thereof include:

The α-unsaturated amines of the formula: ##STR12## wherein R^(1a) is amono-C₁₋₆ alkylamino group, an N-C₁₋₆ alkyl-N-formylamino group or anamino group; R^(2a) is an C₁₋₄ alkyl group or an C₁₋₄ alkoxy group;A^(a) is a chloropyridyl group, or salts thereof;

the α-unsaturated amines of the formula: ##STR13## wherein R^(1b) is amono-C₁₋₆ alkylamino group or an N-C₁₋₆ alkyl-N-formylamino group; A^(a)has the meaning defined hereinbefore, or salts thereof;

the α-unsaturated amines of the formula: ##STR14## wherein R^(1c) is adi-C₁₋₆ alkylamino group; R^(2b) is a hydrogen atom, a formyl group oran C₁₋₄ alkyl group; A^(b) is a pyridyl group or a chloropyridyl group,or salts thereof; and

the α-unsaturated amines of the formula: ##STR15## wherein the symbolshave the meanings defined herein-before, or salts thereof.

Referring to the above formulas [I^(a) ], [I^(b) ] and [I^(c) ], themono-C₁₋₆ alkylamino group represented by R^(1a) or R^(1b) includes,among others, monomethylamino, monoethylamino, mono-n-propylamino,mono-i-proonylamino, mono-n-butylamino, mono-i-butylamino,mono-n-hexylamino, etc. and preferably mono-C₁₋₄ -alkyl amino groupssuch as mono-methylamino, monoethylamino and so on. The N-C₁₋₆alkyl-N-formylamino group represented by R^(1a) or R^(1b) includes,among others, N-methyl-N-formylamino, N-ethyl-N-formylamino,N-n-propyl-N-formylamino, N-i-propyl-N-formylamino,N-n-butyl-N-formylamino, N-n-hexyl-N-foromylamino, etc. and preferablyN-C₁₋₄ alkyl-N-formylamino groups such as N-methyl-N-formylamino,N-ethyl-N-formylamino and so on. The di-C₁₋₆ alkylamino grouprepresented by R^(1c) includes, among others, dimethylamino,N-ethyl-N-methylamino, diethylamino, di-n-propylamino,di-i-propyl-amino, di-n-butylamino, di-i-butylamino, di-n-pentylamino,di-i-pentylamino, di-n-hexylamino, etc. and preferably di-C₁₋₄alkylamino groups such as dimethylamino, N-ethyl-N-methyhylamionio anddiethylamino.

The C₁₋₄ alkyl group represented by R^(2a) or R^(2c) includes, amongothers, the alkyl groups mentioned in the definition of R² above andpreferably methyl, ethyl and so on. The C₁₋₄ alkoxy group represented byR^(2a) includes, among others, the alkoxy groups mentioned in thedefinition of R² above and preferably methoxy, ethoxy and so on. Thechloropyridyl group represented by A^(a) or A^(b) includes, amongothers, 2-chloro-3-pyridyl, 4-chloro-3-pyridyl, 5-chloro-3-pyridyl,6-chloro-3-pyridyl, 3-chloro-4-pyridyl, etc. and preferably6-chloro-3-pyridyl and so on. The pyridyl group represented by A^(b)includes 3-pyridyl, 4-pyridyl, etc. and preferably 3-pyridyl.

Typical α-unsaturated amines of formulas [I°] and [I] or salts thereofinclude:

The α-unsaturated amines of the formula: ##STR16## wherein X^(2a) is ahydrogen atom, C₁₋₄ alkoxycarbonyl or C₁₋₄ alkylsulfonylthiocarbamoyl;R^(2c) is a hydrogen atom, C₁₋₃ acyl, C₁₋₄ alkyl, mono- or di- C₁₋₄alkoxy-C₁₋₄ alkyl, C₇₋₉ aralkyl, mono- or di- C₁₋₄ alkylamino or C₁₋₄alkoxy; A^(c) is 3- or 4- pyridyl, pyrazinyl or 4- or 5- thiazolyl whichmay optionally be substituted with halogen, C₁₋₄ alkyl or C₁₋₄ alkoxy;and R^(3a), R^(4a) and n are as defined above, or salts thereof;

the α-unsaturated amines of the formula: ##STR17## wherein X^(2a) is ahydrogen atom, C₁₋₄ alkoxycarbonyl or C₁₋₄ alkylsulfonylthiocarbamoyl;R^(1d) is amino, mono- or di- C₁₋₄ alkylamino, N- C₁₋₄ alkyl- N- C₁₋₃acylamino, C₇₋₉ aralkylamino, halogenothiazolyl- C₁₋₂ alkylamino or C₁₋₄alkoxy -C₁₋₂ alkylamino; R^(2c) is a hydrogen atom, C₁₋₃ acyl, C₁₋₄alkyl, mono- or di- C₁₋₄ alkoxy- C₁₋₄ alkyl, C₇₋₉ aralkyl, mono- ordi-C₁₋₄ alkylamino or C₁₋₄ alkoxy;

n is ah integer equal to 0, 1 or 2; and A^(d) is 3- or 4-pyridyl,pyrazinyl or 5-thiazolyl which may optionally be substituted withhalogen, C₁₋₄ alkyl or C₁₋₄ alkoxy, or salts thereof;

the α-unsaturated amines of the formula: ##STR18## wherein X^(2b) is ahydrogen atom or C₁₋₂ alkylsulfonylthiocarbamoyl; R^(1e) is amino, mono-or di-C₁₋₂ alkylamino or N-C₁₋₂ alkyl-N-formylamino; R^(2d) is ahydrogen atom, C₁₋₂ alkyl or C₁₋₃ acyl; and A^(e) is a group of theformula: ##STR19## wherein Hal is a halogen atom, or salts thereof; theα-unsaturated amines of the formula: ##STR20## wherein X^(2c) is ahydrogen atom or methylsulfonylthiocarbamoyl; R^(1f) is amino,methylamino, dimethylamino or N-methyl-N-formylamino ; R^(2d) is ahydrogen atom, formyl or C₁₋₂ alkyl ; and A^(e) is a group of theformula: ##STR21## wherein Hal is a halogen atom, or salts thereof; andthe α-unsaturated amines of the formula: ##STR22## wherein R^(1e) isamino, mono- or di-C₁₋₂ alkylamino or N-C₁₋₂ alkyl-N-formylamino ;R^(2e) is C₁₋₂ alkyl or formyl and Hal is a halogen atom, or saltsthereof.

In the above formulas [I^(e) ] to [I^(i) ], the groups represented byX^(2a), X^(2b) and X^(2c), the groups represented by R^(1d), R^(1e) andR^(1f), the groups represented by R^(2c), R^(2d) and R^(2e), and thegroups represented by A^(c), A^(d) and A^(e) are as mentioned above inthe case of X², R¹, R², A° and A.

The compound [I]or its salt can be produced by the analogous knownprocesses and further by the following processes, for instance.

Process 1) ##STR23## wherein X¹, X², R¹, R², n and A have the meaningsdefined hereinbefore; R⁵ is an C₁₋₄ alkyl group such as methyl, ethyl,etc. or an C₇₋₉ aralkyl group such as benzyl etc.; Y is a hydrogen atomor an alkali metal such as sodium, potassium, etc.

Process 2) ##STR24## wherein X¹, X², R¹, R², R³, R⁴, R⁵, n and A havethe meanings defined hereinbefore.

Process 3) ##STR25## wherein Hal is the meanings defined hereinbefore.

Process 4) ##STR26## wherein X¹, X², R¹, R², Hal, n and A have themeanings defined hereinbefore.

Process 5) ##STR27## wherein X¹, X², R¹, R², Hal, n and A have themeanings defined hereinbefore.

Process 6) ##STR28## wherein R¹, R², n, A and R⁵ have the meaningsdefined hereinbefore; X³ is an electron-attracting group.

Process 7) ##STR29## Alkylation, acylation, alkoxycarbonylation,sulfonylation or phosphorylation

[I]

wherein X¹, X², R¹, R², n and A have the meanings defined hereinbefore;R⁶ is a group attached through a nitrogen atom containing at least onehydrogen atom.

In the processes 1) to 7), the compounds [III], [IV] [V], [VI], [IX],[IX'], [IX"], [X], [XIV], [XVI], [XVII], [XVIII], [XIX], [I-5], [I-6]and so on may be used in a form of a salt (e.g. one as mentioned belowin a salt of the compound [I]).

In accordance with the aforementioned Process 1), a compound of generalformula [II] is reacted with an amino compound of general formula [III]or a salt thereof to give a compound of general formula [IV] which isthen reacted with an amino compound of general formula [V] or a saltthereof, or a compound of general formula [II] is reacted with acompound of general formula [V] to give a compound of general formula[VI] which is then reacted with a compound of general formula [III], tothereby give a compound [I]. In practicing the Process 1), the reactionsof [II]→[IV], [IV]→[I], [VI]→[VI] and [VI]→[I] may respectively beconducted in an appropriate solvent. There is no limitation on such asolvent provided that it does not interact with the reactant, reagent orreaction product to give byproducts but a solvent capable of dissolvingboth the reactant and reagent is preferred. As examples of such solvent,there may be mentioned alcohols such as methanol, ethanol, propanol,butanol, etc., aromatic hydrocarbons such as benzene, toluene, xylene,etc., ethers such as diethyl ether, dipropyl ether, dibutyl ether,tetrahydrofuran, dioxane, etc., nitrioles such as acetonitrile,propionitrile, etc., acid amides such as dimethylformamide,dimethylacetamide, etc., sulfoxides such as dimethyl fulfoxide, etc.,sulfones such as sulfolane, etc., and phosphoramides such asnexamethyovphosphoramide etc., as well as various mixtures thereof andmixtures thereof with water. While each of the above reactions isgenerally conducted at atmospheric pressure, it is possible to conductthe reaction under reduced pressure as taught by Japanese UnexaminedPatent Application KOKAI-62-138478 (1987) to remove the byproductlow-boiling thiol and thereby suppress the secondary reaction. When alow-boiling solvent is used, the reaction is preferably conducted atsupratmospheric pressure. For the aforesaid respective reactions, thereaction temperature may range from 30 to 150° C. and preferably from 50to 150° C. The reaction time is generally 5 minutes to 48 hours,depending on the reaction temperature, reactant, reagent and solvent.The proportions of reagents [III] and [V] in the reactions [II]→[IV] and[II]→[VI] may each be 1 to 1.2 molar equivalents relative to [II]. Theuse of [III] and [V] in further excess is preferably avoided to preventby-production of the diamino compound. As the reaction [II]→[IV] and[II]→[VI] in a concentrated reaction mixture may occasionally give theby-product, the diamino compound, it is desirable to avoid the reactionsin such condition. The proportions of reagents [V] and [III] in thereactions [IV]→[I] and [VI]→[I] are generally 1 to 1.5 molar equivalentsand, unlike in the reactions [II]→[IV] and [II]→[VI], the use of [V] or[III] in greater excess may not occasionally induce byproduct formation.A base may be permitted to be concomitantly present for the purpose ofpromoting the reaction or suppressing secondary reactions. As the basefor such purposes, there may be used organic bases such astriethylamine, N-methylmorpholine, pyridine,1,8-diazabicyclo[5,4,0]-7-undecene, 1,5-azabicyclo[4,3,0]non-5-ene, etc.and inorganic bases such as potassium carbonate, potassium hydrogencarbonate, sodium carbonate, sodium hydrogen carbonate, lithiumcarbonate, lithium hydrogen carbonate and so on. Where an alkali metalsalt of reagent [III] or [V] is used, the sodium salt, lithium salt,potassium salt, etc. can be employed. The compound [IV] or [VI] may beisolated and purified by conventional procedures such as concentration,concentration under reduced pressure, pH adjustment, redistribution,solvent extraction, distillation, crystallization, recrystallization,chromatography, etc. and subjected to the next reaction. Alternativelythe reaction mixture containing [IV] or [VI] may be such be directlyused as the starting reactant for the next reaction.

The starting compound of general formula [II] for Process 1) can besynthesized by the procedures described in Chem. Ber. 100, 591 (1967),Acta. Chem. Scand. 22, 1107 (1968), Synthesis 1986, 967, Chem. Ber. 95,2861 (1962), Tetraheron 30, 2413 (1974), Synthesis 1984, 797 and otherliterature or by procedures analogous thereto. The compound [III] can besynthesized by the procedures described in Organic Functional GroupPreparations, Academic Press, Vol 1, Chapter 13 (1968) and Vol 3,Chapter 10 (1972) and other literature or by procedures analogousthereto, and the compound [V] can be synthesized by the proceduresdescribed in Survey of Organic Syntheses, Wiley-Interscience (1970),Chapter 8 and other literature or by procedures analogous thereto.

The aforementioned Process 2) comprises (1) reacting an amino compoundof general formula [III] (Y=H) or an alkali metal salt (e.g. Na or Ksalt) with an isothiocyanic ester of general formula [VII] to give athiourea of general formula [VIII], then reacting said thiourea [VIII]with the compound of the formula : R⁵ I (e.g. methyl iodide, etc.) togive an isothiourea of general formula [IX], and reacting [IX] with anactive methylene compound of general formula [X], (2) reacting an-aminocompound of general formula [III] (Y=H) or an alkali metal salt thereofwith an isothiocyanic ester [VII'], then reacting the resulting thiourea[VIII'] with the compound of the formula: R⁵ I (e.g. methyl iodide,etc.) to give an isothiourea [IX'] and reacting [IX'] with an activemethylene compound [X], or (3) reacting an amino compound of generalformula [V](Y=H) or an alkali metal salt thereof with an isothiocyanicacid ester [VII"], reacting the resulting thiourea [VIII"] with thecompound of the formula: R⁵ I (e.g. methyl iodide, etc.), and reactingthe resulting isothiourea [IX"] with an active methylene compound, tothereby give the desired compound [I].

Referring to Process 2), the reactions [III]_(Y=H) →[VIII], [III]_(Y=H)→[VIII'] and [V]_(Y=H) →[VIII"] and the reactions [VIII]→[IX],[VIII']→[IX'] and [VIII"]→[IX"] can each be conducted by the knownprocedures described in the literature or by procedures analogousthereto. As said literature, there may be mentioned Chemical Society ofJapan (ed.): Shin Jikken Kagaku Koza (New Series of ExperimentalChemistry), Vo. 14, III, Maruzen (1978), Chapters 7 and 21; OrganicFunctional Group Preparations, Vol. 2, Academic Press (1971), Chapters 6and 7, ditto The Second Edition (1986), and so on.

Each of the reactions [III]_(Y=H) →[VIII], [III]_(Y=Y) →[VIII'], and[V]_(Y=H) →[VIII"] can be conducted in an appropriate solvent. There isno limitation on such a solvent provided that it does not interact withthe reactant or the reagent but it is preferable to select a solventcapable of dissolving both the reactant and reagent. As examples of suchsolvent, there may be mentioned aromatic hydrocarbons such as benzene,toluene, xylene, etc.; aliphatic hydrocarbons such as pentane, hexane,heptane, petroleum ether, ligroine, petroleum benzene, etc.; ethers suchas diethyl ether, dipropyl ether, dibutyl ether, tetrahydroofuran,dioxane, etc.; acid amides such as dimethylformamide, dimethylacetamide,etc.; sulfoxides such as dimethyl sulfoxide etc.; sulfones such assulfolane etc.; phosphoramides such as hexamethylphosphoramide etc.; andhalogenated hydrocarbons such as chloroform, dichloromethane, carbontetrachloride, 1,2-dichloroethane, etc. as well as various mixturesthereof. The reaction temperature is about -30° to 200° C. andpreferably 0 to 150° C. The reaction time varies with such conditions asreaction temperature, reactant, reagent, reaction system concentrationand solvent, but generally in the range of 1 minute to 24 hours.

The proportions of compounds [VII], [VII'] and [VII"] required for therespective reactions may range from 0.5 to 2 molar equivalents,preferably 0.8 to 1.2 molar equivalents, relative to [III ]_(Y=H')[III]_(Y=H) and [V]_(Y=H). The compounds [VIII], [VIII] and [VIII"] thusobtained can each be subjected to the next reaction either withoutisolation or after isolation from the reaction mixture by the knownprocedure.

Each of the reactions [VIII]→[IX], [VIII']→[IX'] and [VIII"]→[IX"] mayalso be conducted in a solvent. In addition to the solvents mentionedfor the reactions [III]_(Y=H) →[VIII], [III]_(Y=H) →[VIII'] and[V]_(Y=H) →[VIII"], such other solvents as alcohols, e.g. methanol,ethanol, propanol, butanol, etc.; ketones, e.g. acetone, methyl ethylketone, etc.; and esters, e.g. methyl acetate, ethyl acetate, butylacetate, methyl formate, ethyl formate, ethyl propionate, etc. can alsobe employed. The reagent methyl iodide may be utilized as the solvent.For the purpose of promoting the reaction and minimizing the formationof byproducts, a base may be permitted to be present in the reactionsystem or permitted to act on the reaction system before or after thereaction and there are cases in which such practice contributes toimproved results. As the base that can be used for the above purpose,there may be mentioned sodium hydride, sodium metal, alcoholates such assodium ethoxide, sodium methoxide, potassium tert-butoxide, etc.,organic bases such as triethylamine, diisopropylethylamine, pyridine,N,N-dimethylaniline, etc. and inorganic bases such as potassiumcarbonate and so on. The proportion of the base is preferably 0.8 to 1.2molar equivalents relative to [VIII], [VIII'] or [VIII"]. In the absenceof a base in the reaction system, [IX], [IX'] or [IX"] is formed as thehydroiodide so that this hydroiodide must be neutralized to obtain [IX],[IX'] or [IX"]. The base for this purpose is preferably a water-solubleinorganic base such as sodium carbonate, sodium hydrogen carbonate,potassium hydrogen carbonate, potassium carbonate, sodium hydroxide,potassium hydroxide and so on. The reaction temperature is 0 to 100° C.and preferably 20 to 80° C. The reaction time is generally 0.1 to 24hours. The proportion of methyl iodide required for the reaction is notless than 1 molar equivalent relative to [VIII], [VIII'] or [VIII"] andmay be used in a larger amount as the solvent. The [IX], [IX'] or [IX"]thus produced may be isolated by the conventional procedure beforesubmission to the next reaction or the reaction product mixture may bedirectly used as the starting material in the next reaction.

Each of the reactions [IX]→[I-1], [IX']→[I-2] and [IX"]→[I-3] can beconducted in accordance with the procedures described in Tetrahedron 37,1453 (1981) Indian Journal of Chemistry 15B, 297 (1977) and otherliterature. The reaction may be conducted using the active methylenecompound [X] in excess as a solvent or may be carried out in a differentsolvent. As the solvent just mentioned above, there may be used aromatichydrocarbons such as benzene, toluene, xylene, etc., aprotic polarsolvents such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, sulfolane, hexamethylphosphoramide, etc., and ethers such astetrahydrofuran, dioxane and so on. Particularly where an aprotic polarsolvent is used and the reaction is conducted under reduced pressurewith the byproduct methylmercaptan being dispelled out of the reactionsystem, the formation of byproducts can be suppressed and the reactionyield improved. The reaction may also be conducted in the presence of acatalyst. As such catalyst, there may be employed zinc chloride, zincbromide, zinc iodide, cupric chloride and so on. The reactiontemperature is 30 to 200° C., preferably 50-150° C. The reaction time isgenerally 0.1 to 48 hours. The proportion of active methylene compound[X] necessary for the reaction is 1 to 5 molar equivalents relative to[IX], [IX'] or [IX"]. Where [X] is a low-boiling compound, it can beused in a solvent amount.

The starting compounds [VII], [VII'] and [VII"] can be synthesized bythe procedures described in Organic Functional Group Preparations, Vol.1, Academic Press (1968), Chapter 12 and other literature or byprocedures analogous thereto, and the compound [X] can be synthesized byprocedures described in Formation of C--C Bonds, Vol. 1, Georg ThiemePublishers, Stuttgart (1973) and other literature.

The aforementioned Process 3) comprises reacting a compound [XI] or[XII] with an amino compound of general formula [III] or a salt thereof(e.g. the salt of an alkali metal such as Na or K) and reacting theresulting product further with an amino compound of general formula [V]or a salt (alkali metal salt) thereof or, alternatively, reacting acompound [XI] or [XII] with an amino compound of general formula [V] ora salt thereof and then reacting the resulting product with an aminocompound of general formula [III] or a salt thereof to give the desiredcompound [I].

The reactions in Process 3) can be conducted in the same manner as thosein Process 1) and the reaction conditions described for Process 1) canbe utilized. However, since compounds [XI] and [XII] are generally morereactive than compound [II], the reactions are preferably conductedunder somewhat milder conditions as compared with Process 1).

The compounds [XI] and [XII] can be prepared by procedures described inChemical Abstracts 44, 1011f, Journal of Organic Chemistry 25, 1312(1960) and other literature or by procedures analogous thereto.

The aforementioned Process 4) comprises reacting an acid amide ofgeneral formula [XIII] or an acid amide of general formula [XV] with ahalogenating agent to give a halide of general formula [XIV] or [XVI]and reacting the halide with an amino compound of general formula [V] ora salt thereof or an amino compound of general formula [III] or a saltthereof to give the desired compound [I].

The reaction of [XIII]→[XIV] and that of [XV]→[XVI] are preferablyconducted in a solvent. As such solvent, there may be mentionedhalogenated hydrocarbons such as dichloromethane, chloroform, carbontetrachloride, 1,2-dichloroethane, etc., ethers such as diethyl ether,tetrahydrofuran, dioxane, etc., nitriles such as acetonitrile,propionitrile, etc. and so on. This reaction is preferably carried outunder anhydrous conditions. The halogenating agent may for example bephosphorus pentachloride, hosphorus oxychloride, phosphorus trichloride,thionyl chloride, oxalyl chloride or the like. The proportion of thehalogenating agent is 1 to 10 molar equivalents, preferably 1 to 5 molarequivalents, relative to [XIII] or [XV]. Preferably a base is permittedto be present in the reaction system in order to trap the byproducthydrogen chloride, and as such base, there may be used various organicbases such as pyridine, triethylamine, diisopropylethylamine,N-methylmorpholine, N,N-dimethylaniline, N,N-diethylamine and so on. Thereaction temperature is -80° to 100° C. and preferably -50° to 50° C.The reaction time is generally 0.1 to 24 hours, depending on thereactant, base, solvent, reaction concentration and reactiontemperature. The products [XIV] and [XVI] can be isolated and purifiedby the aforementioned known procedures before submission to the nextreaction or the reaction product mixture may be directly used in thenext reaction.

The reaction of [XIV]→[I] and that of [XVI]→[I] can each be conducted ina solvent similar to those mentioned for the reactions of [XIII]→[XIV]and [XV]→[XVI], preferably under anhydrous conditions. The proportion of[V] or a salt thereof and that of [III] or a salt thereof are 1 to 10molar equivalents, preferably 1 to 5 molar equivalents, relative to[XIV] and [XVI], respectively. For the purpose of trapping the byproducthydrogen chloride, [V] or a salt thereof or [III] or a salt thereof canbe used in excess but for economy, a different base is preferablypermitted to be present. A such base, there may be used any of the basesmentioned for the reactions of [XIII]→[XIV] and [XV]→[XVI]. The reactiontemperature is -80° C. to 100° C. and preferably -50° C. to 50° C. Thereaction time is generally 0.1 to 24 hours. The starting compounds[XIII] and [XV] can be synthesized by the procedures described inFormation of C--C bonds, Vol. 1, Georg Thieme Publishers, Stuttgart(1973) and Chemical Society of Japan(ed.): `Shin Jikken Kagaku Koza`(New Series of Experimental Chemistry), Vol. 14,II, Maruzen (1977),Chapters 5 and 7 and other literature or by procedures analogousthereto.

The aforementioned Process 5) comprises reacting a compound of generalformula [XVII] with a halide of general formula [XVIII] to give thedesired compound [I].

The reaction according to Process 5) is preferably conducted in anappropriate solvent. As such solvent, there may be employed acid amidessuch as dimethylformamide, dimethylacetamide, etc., sulfoxides such asdimethyl sulfoxide etc., sulfones such as sulfolane etc., phosphoramidessuch as hexamethylphosphoramide etc., ethers such as tetrahydrofuran,dioxane, 1,2-dimethoxyethane, diethylene glycol dimethyl ether, etc.,and so on. Mixtures of such solvents may likewise be employed. Thisreaction is preferably conducted in the presence of a base. As suchbase, there may be mentioned sodium hydride, potassium hydride, lithiumhydride, calcium hydride, n-butyllithium, lithium diisopropylamide,sodium amide and so on. It is preferable that the compound [XVII] beconverted to the salt of said base before it is subjected to thereaction. The proportion of the base is preferably 1 to 1.5 molarequivalents relative to [XVII]. This reaction is preferably conductedunder anhydrous conditions and may be carried out in an atmosphere ofnitrogen gas or argon gas. The proportion of [XVIII] is 1 to 2 molarequivalents, preferably 1 to 1.5 molar equivalents, relative to [XVII].The reaction temperature is -70° C. to 150° C. and preferably -50° C. to100° C. The reaction time is generally 0.1 to 48 hours.

The compound [XVII] can be easily prepared, for example by using acompound of general formula R² N₂ wherein R² has the meaning definedhereinbefore, instead of compound [III] in said Processes 1 through 4).The compound [XVIII] can be synthesized by the process described inOrganic Functional Group Preparations, Vol. 1, Academic Press (1968),Chapter 6 and other literature or by procedures analogous thereto.

The aforementioned Process 6) comprises subjecting a compound of generalformula [XIX], which falls within the category of compound [I], tohydrolysis reaction and, then, to decarboxylation reaction to give acompound of general formula [I-4] which falls within the category ofcompound [I].

The above hydrolysis reaction can be conducted under the conditions ofhydrolysis of esters which are known in the art.

Thus, in a solvent (inclusive of a solvent mixture) such as water,alcohols (e.g. methanol, ethanol, propanol, butanol, diethylene glycol,2-methoxyethanol, etc.), ketones (e.g. acetone etc.), ethers (e.g.tetrahydroojuran, dioxane, dimethoxyethane, etc.), amides (e.g.dimethylformamide, dimethylacetamide, hexamethylphosphoramide, etc.),sulfoxides (e.g. dimethyl sulfoxide etc.), sulfones (e.g. sulfolaneetc.) and carboxylic acids (e.g. formic acid, acetic acid, etc.), thehydrolysis reaction can be conducted using an acid (for example, mineralacids such as hydrochloric acid, hydrobromic acid, sulfuric acid, etc.,organic acids such as p-toluenesulfonic acid etc., strongly acidicion-exchange resins, and so on) or a base (for example, sodiumhydroxide, potassium hydroxide, potassism carbonate, sodium hydrogencarbonate, barium hydroxide, calcium hydroxide, sodium methoxide,ammonia and so on), although the use of a base is preferred. Theproportion of the base is about 1 to 10 molar equivalents, preferablyabout 1.2 to 4 molar equivalents, relative to [XIX]. The reactiontemperature is about -20° C. to 200° C., preferably about -5° C. to 120°C., and the reaction time is about 0.1 to 48 hours, preferably about 0.1to 24 hours.

The decarboxylation reaction proceeds simultaneously with saidhydrolysis reaction in many cases and usually no special procedure isrequired. If necessary, this reaction may he carried out by heating inthe hydrolysis solvent. The reaction temperature is generally about 0 to200° C., preferably 30 to 150° C., and the reaction time is 0.1 to 48hours and preferably 0.1 to 24 hours.

The aforementioned Process 7) comprises subjecting a compound of generalformula [I-5] or a compound of general formula [I-6] to alkylation,acylation, alkoxycarbonylation, sulfonylation or phosphorylation to givea compound [I].

For alkylation, the amino group in [I-5] or [1-6] is alkylated with analkylating agent such as an alkyl chloride, alkyl bromide, alkyl iodide,dialkyl sulfate or the like. The proportion of the alkylating agent isabout 1 to 3 equivalents relative to the starting compound in manyinstances. This alkylation reaction may be conducted under the sameconditions as those described for Process 5).

The acylation, sulfonylation, phosphorylation and alkoxycarbonylationreaction can each be conducted by procedures known per se or byprocedures analogous thereto.

The acylating agent for said acylation reaction may for example be anacyl halide or acid anhydride containing a group of R¹ or R². Thesulfonylating agent for said sulfonylation reaction may for example be asulfonyl halide or sulofonic anhydride containing a group of R¹ or R².The alkoxycarbonylating agent for said alkoxycarbonylation reaction mayfor example an alkoxycarbonyl halide or carbonate containing a group ofR¹ or R². The preferred halogens in the above-mentioned halide reagentsare bromine and chlorine. The proportion of each such reagent is atleast one molar equivalent, preferably about 1 to 5 molar equivalents,relative to the starting compound. Where an acid anhydride is used asthe acylating agent in the above acylation reaction, it can be employedin excess. These reactions are carried out in a solvent capable ofdissolving the compound [I-5] or [I-6] and the respective reagents andas preferred examples of such solvent, there may be mentioneddichloromethane, chloroform, dichloroethane, tetrahydrofuran, dioxane,N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulofoxide,hexamethylphosphorotriamide, pyridine and so on. The reactiontemperature is about -50° C. to 150° C. and the reaction time is about0.1 to 48 hours. The reaction may be hastened and the secondaryreactions suppressed to improve the yield when the reaction is conductedin the concomitant presence of an amine such as triethylamine,dimethylaminopyridine, pyridine, N,N-dimethylaniline,N,N-diethylaniline, etc., sodium hydride, potassium hydride, sodiumamide, n-butyllithium, lithium diisopropylamide or the like.

The object compound (I) or salt thereof thus produced can be isolatedand purified by conventional procedures such as concentration,concentration under reduced pressure, distillation, fractionaldistillation, pH adjustment, redistribution, solvent extraction,crystallization, recrystallization, chromatography and so on.

Where the compound [I] is obtained as the free compound, it can beconverted to a agrochemically useful salt and where a salt is obtained,it can be converted to the free compound [I], using the conventionalprocedure in either case. Where the compound [I] contains acidic groupssuch as carboxyl, sulfo and/or phosphono groups in its positions X¹, X²,R¹, R² and/or A, it may form a salt with a base. As the base used forthis purpose, there may be mentioned inorganic bases such as sodium,potassium, lithium, calcium, magnesium, ammonia, etc. and organic basessuch as pyridine, collidine, triethylamine, triethanolamine and so on.Where the compound [I] contains basic groups such as amino, substitutedamino and/or other groups in its positions X¹, X², R¹, R² and/or A, itcan form an acid addition salt. As examples of such acid addition salts,there may be mentioned hydrochloride, hydrobromide, hydroiodide,nitrate, sulfate, phosphate, acetate, benzoate, maleate, fumarate,succinate, tartarate, citrate, oxalate, glyoxalate, aspartate,methanesulfonate, methanedisulfonate, 1,2-ethanedisulfonate,benzenesulfonate and so on.

The compound [I] may form an inner salt, which also falls within thescope of the invention.

The compound [I] and its stereoisomer and tautomer (for example, wherethe compound [I] is a compound of the formula ##STR30## wherein thesymbols have the meanings defined herein-before, its tautomer of theformula ##STR31## wherein the symbols have the meanings definedherein-before, also falls into the category of compound [I]) can beused, either independently or in the form of a mixture, as aninsecticidal/miti(acari)cidal agent.

The compound [I] and its salt according to the invention are effectivein the control of household pests and animal or plant parasitizinginsects and mites, and exhibit strong pesticidal effects as a contactpoison when applied directly to the host animals and plants. The mostsalient feature of the compound, however, is that it displays potentpesticidal effects even after it has been absorbed onto plants via theroot, leaf, stem or the like and come into contact with the pests as thepests suck or gnaw on the plants. This property is advantageous in thecontrol of sucking/biting insets and ticks. Furthermore, the compound ofthe invention is of low toxicity to plants and fish, thus having safeand useful characteristics as an agricultural pesticide.

The compound [I] and its salts and compositions containing the same areparticularly effective in the control of the following kinds of pests:pests of the order Hemiptera such as Eurydema rugosum, Scotinopharalurida, Riptortus clavatus, Stephanitis nashi, Laodelophax striatellus,Nilaparvata lugeops, Nephotettix cincticeis, Unaspis yanonensis, Aophisglycines, Litaophis erysimi, Brevicoryne brassicae, Aphis qossvoii,Sogattela furcifera, Nezara viroldula, Trialeurodes vaporariorum, Myzuspersicae, Pseudococcus comstocki, Aphis promi, Nezara spp., Cimexlectularius, Psylla spp., etc.; pests of the order Lepidoptera such asSpodoptera litura, Plutella xylostella, Pieris rapae crucivora, Chilosuoppressalis, Plusia nigrisigna, Halicoverpa assulta, Leucaniaseparata, Mamestra brassicae, Adoxophyes orana, Notarcha derogata,Cnaphalocrocis medinalis, Phthorimaea operculella, etc.; pests of theorder Cleoptera such as Epilachna vigintioctopunctata, Aulacophorafemoralis, Phyllotreta striotata, Oulema oryzae, Echinocnemus sauameus,etc.; pests of the order DiDtera such as Musca domestica, Culex opidienspallens, Tabanus trigonus, Hylemyia antigua, Hylemyia platura etc.;pests of the order Orthoptera such as Locusta migratoria, Gryllotalpaafricana, etc., cockroaches such as Blattella germanica, Periplanetafuliocinosa, etc.; spider mites such as Tetranychus urticae, Panonychuscitri, Tetranychus kanzawai, Tetranychus cinnabarinus, Panonychus ulmi,Aculops pelekassi, etc., and nematodes such as Aphelenchoides besseyiand so on.

For application of the compound [I] or salt of the invention as aninsectide/miti(acari)cide, it can be formulated into any possible anddesired application form for agrochemicals. Thus, by dissolving ordispersing one or more species of compound [I] and salt thereof in anappropriate liquid carrier or vehicle or admixing them with or causingthem adsorbed on an appropriate solid carrier, an emulsifiableconcentrate, oil preparation, wettable powders, dusts, granules,tablets, aerosol, ointment or the like can be manufactured. Ifnecessary, such compositions may be further supplemented withemulsifiers, suspending agents, spreader-stickers, penetrating agents,wetting agents, thickeners, stabilizers and so on, and any of suchpreparations can be manufactured by the per se known procedures.

The concentration of the active ingredient (compound [I] or saltthereof) in such an insecticidal/miti(acari)cidal composition of theinvention depends on the intended application. Generally speaking, theproper concentration is about 10 to 90 weight percent for emulsifiableconcentrate and wettable powders, about 0.1 to 10 weight percent foroils and dusts and about 1 to 20 weight percent for granules, forinstance. However, the concentration may be adjusted according to theintended application. In the case of an emulsifiable concentrate or awettable powder, it is diluted with water or the like to a suitableconcentration (for example, 100 to 100,000-fold dilution) beforespraying.

The liquid carrier (solvent) includes, among others, water, alcohols(e.g. methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropylalcohol, ethylene glycol, etc.), ketones (e.g. acetone, methyl ethylketone, etc.), ethers (e.g. dioxane, tetrahydrofuran, ethylene glycolmonomethyl ether, diethylene glycol monomethyl ether, propylene glycolmonomethyl ether, etc.), aliphatic hydrocarbons (e.g. kerosin, kerosene,fuel oil, machine oil, etc.), aromatic hydrocarbons (e.g. benzene,toluene, xyiene, solvent naphtha, methylnaphthalene, etc.), halogenatedhydrocarbons (e.g. methylene chloride, chloroform, carbon tetrachloride,etc.), acid amides (e.g. dimethylformamide, dimethylacetamide, etc.),esters (e.g. ethyl acetate, butyl acetate, fatty acid glycerin esters,etc.), nitriles (e.g. acetonitrile, propionitrile, etc.) and so on. Oneof these solvents or a mixture of two or more of them can be used as thecarrier.

The solid carrier (diluent-volume builder) includes, among others,vegetable powders (e.g. soybean flour, tobacco flour, wheat flour,sawdust, etc.), mineral powders (e.g. clays such as kaolin, bentonite,acid clay, etc., talcs such as talc, pyrophillite, etc. and silicatessuch as diatomaceous earth, mica powder, etc.), alumina, sulfur powder,activated carbon and so on. These powders can be used singly or as amixture.

The ointment base that can be employed include, among others, any or amixture of polyethylene glycol, pectin, higher fatty acid polyhydricalcohol esters such as monostearic acid glycerin ester etc., cellulosederivatives such as methylcellulose etc., sodium alginate, bentonite,higher alcohols, polyhydric alcohols such as glycerin, vaseline, whitepetrolatum, liquid paraffin, lard, vegetable oils, lanolin, anhydrouslanolin, hydrogenated oils, resins, etc., or mixtures thereof with theany of the following surfactants.

Surfactants which can be optionally used as said emulsifier,spreader/sticker, penetrating agent, dispersing agent, etc. includesoaps and nonionic or anionic surfactants such as polyoxyethylene alkylaryl ethers (e.g. Noigen, E. A. 142®, manufactured by Daiichi KogyoSeiyaku Co., Ltd., JAPAN; Nonal®, Toho Chemical, JAPAN), alkylsulfates(e.g. Emal 10®, Emal 40®, manufactured by Kao Corporation, JAPAN),alkylsulfonates (e.g. Neogen®, Neogen T®, manufactured by Daiichi KogyoSeiyaku Co., Ltd.; Neopellex®, manufactured by Kao Corporation),polyethylene glycol ethers (e.g. Nonipol 85®, Nonipol 100®, Nonipol160®, manufactured by Sanyo Chemical Industries, Ltd., JAPAN) andpolyhydric alcohol esters (e.g. Tween 20®, Tween 80®, manufactured byKao Corporation).

The compound of the invention can be used in combination with otherinsecticides (pyrethroid insecticides, organophosphorus insecticides,carbamate insecticides, natural insecticides, etc.), miticides(acaricides), nematocides, herbicides, plant hormones, plant growthregulators, fungicides (copper fungicides, organochlorine fungicides,organosulfur fungicides, phenolic fungicides, etc.), synergists,attractants, repellents, pigments, fertilizers and so on.

The resulting insecticide/miticide according to the invention is of lowtoxicity and safe and is an excellent agrochemical. Theinsecticidal/miticidal agent of the invention can be used in the samemanner as the conventional insecticides and miticides and produceseffects surpassing those of the latter. For example, theinsecticidal/miticidal agent of this invention can be applied forcontrol of pests by such procedures as nursery bed treatment,stem/foliage spray or dusting, direct application to pests, paddy watertreatment, soil treatment and so on. The dosage can be selected from abroad range according to the timing, site and method of application.Generally speaking, the preferred dosage of the active ingredient(compound [I] or a salt thereof) per hectare is 0.3 g to 3,000 g and,for still better revolts, 50 g to 1,000 g. Where theinsecticidal/miticidal agent of the invention is provided as a wettablepowder, it can be used as diluted so that the final concentration of theactive ingredient will be in the range of 0.1 to 1,000 ppm, preferably10 to 500 ppm.

The compound [I] of the invention has excellent insecticidal/miticidalactivity which is well demonstrated by the following test examples.

Test Example 1

Effect against brown planthoppers (Nilaparvata lugens)

An emulsifiable concentrate of the compound of the invention, preparedin the same manner as Example 112 below, was diluted with water to aconcentration of 500 ppm and sprayed over the stems and leaves of riceseedlings in the 2-leaf stage at the rate of 10 ml per paper pot. Waterwas put in test tubes and the treated rice seedlings were placedtherein. Then, 10 brown planthopper larvae were released in each tube,which was then capped with an aluminum cap. The test tubes weremaintained in an incubator at 25° C. and the dead insects were counted 7days after release. The % mortality was calculated using the followingformula. ##EQU1##

The results are shown in Table 1.

                  TABLE 1                                                         ______________________________________                                        Effect against brown planthoppers                                             Compound of the invention                                                                        % Mortality after                                          (Compound No.)     7 days                                                     ______________________________________                                         3                 100                                                         4                 100                                                         7                 100                                                        12                 100                                                        14                 100                                                        17                 100                                                        18                 100                                                        19                 100                                                        20                 100                                                        24                 100                                                        25                 100                                                        26                 100                                                        28                 100                                                        29                 100                                                        31                 100                                                        32                 100                                                        33                 100                                                        34                 100                                                        35                 100                                                        37                 100                                                        38                 100                                                        40                 100                                                        41                 100                                                        42                 100                                                        43                 100                                                        44                 100                                                        45                 100                                                        46                 100                                                        47                 100                                                        49                 100                                                        50                 100                                                        51                 100                                                        52                 100                                                        55                 100                                                        56                 100                                                        57                 100                                                        58                 100                                                        59                 100                                                        60                 100                                                        61                 100                                                        62                 100                                                        64                 100                                                        65                 100                                                        67                 100                                                        68                 100                                                        70                 100                                                        71                 100                                                        72                 100                                                        73                 100                                                        75                 100                                                        76                 100                                                        77                 100                                                        78                 100                                                        79                 100                                                        80                 100                                                        84                 100                                                        85                 100                                                        86                 100                                                        88                 100                                                        89                 100                                                        90                 100                                                        91                 100                                                        92                 100                                                        93                 100                                                        95                 100                                                        96                 100                                                        97                 100                                                        98                 100                                                        99                 100                                                        100                100                                                        101                100                                                        102                100                                                        103                100                                                        104                100                                                        105                100                                                        106                100                                                        107                100                                                        108                100                                                        109                100                                                        110                100                                                        111                100                                                        112                100                                                        113                100                                                        mixture (7:3) of 114 and 115                                                                     100                                                        116                100                                                        117                100                                                        118                100                                                        mixture (90:10) of 119 and 120                                                                   100                                                        mixture (40:60) of 119 and 120                                                                   100                                                        121                100                                                        122                100                                                        mixture (70:30) of 123 and 124                                                                   100                                                        124                100                                                        125                100                                                        126                100                                                        127                100                                                        128                100                                                        129                100                                                        130                100                                                        131                100                                                        ______________________________________                                    

It is apparent from Table 1 that the compound [I] of the invention hasexcellent pesticidal activity against brown planthoppers.

The following reference and working examples are further illustrative ofthe invention but should by no means be construed as limiting the scopeof the invention.

In the procedures of column chromatography described in the referenceand working examples, elution was carried out under monitoring by thinlayer chromatography (TLC). For TLC observation, Merck Kieselgel 60 F₂₅₄(Art. 5715) was used as the TLC plate, the column chromatographic eluentas the developing solvent, and the UV detector as the means ofdetection. As the silica gel for column Dacking, Merck Kieselgel 60(70-230 mesh, Art. 7734) was used. The NMR data represent ¹ H-NMRspectra determined using tetramethylsilane as either an internal or anexternal standard and, unless otherwise indicated, a Varian EM390 (90MHz) spectrometer. The NMR data carrying the indication of 400 MHz weregenerated using a JEOL GX-400 (400 MHz) spectrometer. All the δ data arein ppm. Where a solvent mixture was used as the developer or eluent, theratio of respective solvents is given in parentheses.

The abbreviations used in the reference and working examples have thefollowing meanings.

Me: methyl; nPr: n-propyl, iPr: isopropyl, Et: ethyl, Ac: acetyl, s:singlet, br: broad, d: doublet, t: triplet, q: quartet, m: multiplet,dd: doublet doublet, tt: triplet triplet, dt: doublet triplet, td:triplet doublet, ddd: doublet doublet doublet, S+S: two singlets, J:coupling constant, Hz: hertz, CDCl₃ : chloroform-d, D₂ O: deuteriumoxide, DMSO-d₆ : dimethyl-d₆ sulfoxide, %: weight %, m.p.: meltingpoint.

REFERENCE EXAMPLE 1

N-Methyl-N-3-pyridylmethylamine

To 25 ml of a 20% aqueous solution of NAOH stirred under cooling withice-water, a 40% aqueous solution of methylamine (13.6 g, 0.175 mole)was added dropwise over 5 minutes, followed by further dropwise additionof an aqueous solution (10 ml) of 8.2 g (0.05 mole) of 3-pyridylmethylchloride hydrochloride over 10 minutes. The mixture was further stirredat room temperature for 2 hours and, then, extracted with CH₂ Cl₂ (100ml×3). The extract was dried over MgSO₄ and distilled to remove thesolvent. The residue was subjected to vacuum distillation to give 2.6 gof the title compound as a yellow oil.

b.p.: 66° C./2 mmHg

NMR (CDCl₃) δ: 1.48 (s, NH), 2.45 (s, NMe), 3.76 (s, CH₂ N)

REFERENCE EXAMPLE 2

N-(6-Chloro-3-pyridylmethyl)phthalimide

In 20 ml of EtOH, 9.4 g (6.4×10⁻² mole) of phthalimide and 4.2 g of KOHwere stirred for 30 minutes, followed by addition of 100 ml of DMF(dimethylformamide) and 5.2 g (2.5×10⁻⁻² mole) of6-chloro-3-pyridylmethyl chloride. The mixture was stirred at 60° C. for1 hour. The EtOH and DMF were distilled off under reduced pressure andthe residue was chromatographed on a silica gel column and eluted withCH₂ Cl₂. The above procedure gave 6.7 g of the title compound ascolorless needles.

m.p.: 142-143° C.

NMR (CDCl₃) δ: 4.85 (s, 2H), 7.28 (d, J=8.9 Hz, 1H), 7.6-8.0 (m, 5 H),8.51 (d, J=2.8 Hz, 1H)

REFERENCE EXAMPLE 3

6-Chloro-3-pyridylmethylamine

Hydrazine hydrate (1.7 ml) was added to a refluxing solution of 6.5 g(2.4×10⁻² mole) of N-(6-chloro-3-pyridylmethyl)phthalimide in 100 ml ofEtOH, and the mixture was further refluxed for 1 hour. After addition of20 ml of water, the ethanol was distilled off under reduced pressure.Concentrated hydrochloric acid (25 ml) was added to the residue and themixture was refluxed for 1 hour. After cooling, the reaction mixture wasneutralized with NaOH and the aqueous layer was saturated with NaCl andextracted with Et₂ O. The extract was dried over Na₂ SO₄ and the solventwas distilled off to give 2.4 g of the title compound as a yellow oil.

NMR (CDCl₃) δ: 1.4-2.0 (br, 2H), 3.89 (s, 2H), 7.27 (d, J=8.9 Hz, 1H),7.67 (dd, J=8.9 & 2.7 Hz, 1H), 8.32 (d, J=2.7 Hz, 1H)

REFERENCE EXAMPLE 4

1-Methylthio-1-piperidino-2-nitroethylene

In 20 ml of EtOH was dissolved 1.7 g (0.01 mole) of1,1-bis(methylthio)-2-nitroethylene under heating and 0.9 g (0.01 mole)of piperidine dissolved in 10 ml of EtOH was added dropwise in 3portions at 30-minutes intervals under reflux. After 2 hours of reflux,the solvent was distilled off and the residue was chromatographed on asilica gel column and eluted with AcOEt-toluene (2:3). The aboveprocedure yielded 0.8 g of the title compound as yellow prisms.

m.p.: 65-67° C.

NMR (CDCl₃) δ: 2.45 (s), 6.68 (s)

IR (Nujol): 1650, 1530, 1380 cm⁻¹

REFERENCE EXAMPLE 5

1,1-bis(Methylthio)-2-nitroethylene was reacted with various amines inthe same manner as Reference Example 4 to give the following compounds.

(1) 1-Methylamino-1-methylthio-2-nitroethylene (yellow scales)

m.p.: 111-112° C.

NMR (CDCl₃) δ: 2.45 (s), 3.15 (d), 6.62 (s), 10.5 (br s)

IR (Nujol): 3200, 1575, 1345 cm⁻¹

(2) 1-(2,2-Dimethyl-1-hydrazino)-1-methylthio-2-nitroethylene (paleyellow prisms)

m.p.: 139-140° C.

NMR CDCl₃) δ: 2.26 (s), 2.65 (s), 6.40 (s), 10.46 (br s)

IR (Nujol): 3130, 1535, 1340 cm⁻¹

REFERENCE EXAMPLE 6

N-(6-Chloro-3-pyridylmethyl)-N-methylamine

(1) In 30 ml of toluene, 0.8 g (5.7×10 moles) of6-chloropyridine-3-aldehyde and 10 g of Na₂ SO₄ were mixed and while themixtures was stirred, a 40% aqueous solution of methylamine (1.4 g,1.1×10⁻² mole) was added dropwise over 30 minutes, followed by additionof 10 g of MgSO₄. The mixture was allowed to stand at room temperatureovernight, after which it was filtered. The filtrate was concentrated togive 0.6 g (yield 68%) of N-(6-chloro-3-pyridylmethylidene)methylamineas crystals.

NMR (CDCl₃) δ: 3.52 (d, 3H), 7.35 (d, J=8.8 Hz, 1H), 8.04 (dd, J=8.8 &2.7 Hz, 1H), 8.2-8.4 (m, 1H), 8.59 (d, J=2.7 Hz, 1H)

(2) In 10 ml of MeOH was dissolved 0.6 g (3.8×10⁻³ moles) of theN-(6-chloro-3-pyridylmethylidene)methylamine obtained in (1) and understirring at 0° C., 0.07 g (1.9×10⁻³ mole) of sodium borohydride wasadded in small portions. After 30 minutes, MeOH was distilled off andthe residue was diluted with 5 ml of water and extracted with AcOEt (10ml×3). The extract was dried over MgSO₄ and concentrated to give 0.43 g(yield 71%) of the title compound as a yellow oil.

NMR (CDCl₃) δ: 1.90 (s, 1H), 2.44 (s, 3H), 3.74 (s, 2H), 7.28 (d, J=8.2Hz, 1H). 7.67 (dd, J=8.2 & 2.8 Hz, 1H), 8.31 (d,J=2.8 Hz, 1H)

REFERENCE EXAMPLE 7

Pyridine-3-aldehyde or quinoline-3-aldehyde was reacted with variousamines or 1,1-dimethylhydrazine in the same manner as Reference Example6 (1) to give the following compounds.

(1) N-(3-Pyridylmethylidene)ethylamine (pale yellow oil)

NMR (CDCl₃) δ: 1.30(t), 3.66(q), 8.31(s)

(2) N-(3-Pyridylmethylidene)-2-dimethoxyethylamine (yellow oil)

NMR (CDCl₃) δ: 3.43 (s), 3.83 (d), 4.71 (t), 8.35 (s)

(3) N-(3-Pyridylmethylidene)-2-methoxyethylamine (pale yellow oil)

NMR (CDCl₃) δ: 3.39 (s), 3.76 (m), 8.36 (s)

(4) N-(3-Quinolylmethylidene)methylamine (yellow oil)

NMR (CDCl₃) δ: 3.53 & 3.54 (each s, =NMe), 7.1-8.5 (m, 6H,quinoline-H₆), 9.28 & 9.30 (each s, CH═N)

IR (neat): 1690, 1645, 1615, 1490, 785, 750 cm⁻¹

(5) 1,1-Di-methyl-2-(3-pyridylmethylidene)hydrazine (colorless oil)

b.p.: 110° C./2 mmHg

NMR (CDCl₃) δ: 3.00 (s, NMe₂), 7.15 (s, CH═N)

IR (neat): 1580, 1550, 1465, 1415, 1040, 710 cm⁻¹

(6) N-(3-Pyridylmethylidene)-n-propylamine (pale yellow oil)

NMR (CDCl₃) δ: 0.95 (t), 1.75 (m), 3.62 (t), 7.33 (dd), 8.12 (dt), 8.31(s, CH═N), 8.62 (dd), 8.86 (d)

(7) N-(3-Pyridylmethylidene)-n-butylamine (pale yellow oil)

NMR (CDCl₃) δ: 0.94 (t), 1.20-1.90 (m), 3.65 (t), 7.33 (dd), 8.12 (dt),8.31 (s, CH═N), 8.62 (dd), 8.86 (d)

(8) N-(3-Pyridylmethylidene)benzylamine (pale yellow oil)

NMR (CDCl₃) δ: 4.84 (s, CH₂), 7.33 (s, C₆ H₅), 7.33 (dd), 8.15 (dt),8.40 (br s, CH═N), 8.65 (dd), 8.88 (d)

REFERENCE EXAMPLE 8

The compounds of Reference Example 7 (1)-(4) and (6)-(8) wererespectively reacted in the same manner as Reference Example 6 (2) togive the following compounds.

(1) N-Ethyl-N-(3-pyridylmethyl)amine (pale yellow oil)

b.p.: 60° C./0.7 mmHg

NMR (CDCl₃) δ: 1.13 (t), 1.45 (br s), 3.70 (q), 3.82 (s)

(2) N-(2-Dimethoxyethyl)-N-(3-pyridylmethyl)amine (yellow oil)

NMR (CDCl₃) δ: 1.73 (br s), 2.75 (d), 3.36 (s), 3.82 (br s), 4.46 (t)

(3) N-(2-Methoxyethyl)-N-(3-pyridylmethyl)amine (colorless oil)

b.p.: 90° C./0.7 mmHg

NMR (CDCl₃) δ: 1.86 (br s), 2.82 (t), 3.36 (s), 3.53 (t), 3.83 (s)

(4) N-Methyl-N-(3-quinolylmethyl)amine (yellow oil)

NMR (CDCl₃) δ: 2.24 (s, NMe), 3.09 (br, NH), 3.86 (s, NCH₂), 7.3-8.2 (m,5 H, quinoline-H₅), 8.83 (d, J=2 Hz, 1H, quinoline-H₁)

(5) N-(n-Propyl)-N-(3-pyridylmethyl)amine (yellow oil)

b.p.: 85° C./1.5 mmHg

NMR (CDCl₃) δ: 0.90 (t), 1.30-1.76 (m), 1.64 (br s, NH), 2.60 (t), 3.80(s), 7.23 (dd), 7.67 (dt), 8.43-8.63 (m)

(6) N-(n-Butyl)-N-(3-pyridylmethyl)amine (pale yellow oil)

b.p.: 83° C./1 mmHg

NMR (CDCl₃) δ: 0.78-1.06 (r), 1.1-1.75 (m), 1.45 (br s, NH), 2.63 (t),3.80 (s), 7.24 (dd), 7.69 (dt), 8.46-9.63 (m, 2H)

(7) N-Benzyl-N-(3-pyridylmethyl)amine (colorless oil)

b.p.: 125° C./0.5 mmHg

NMR (CDCl₃) δ: 1.83 (br s, NH), 3.77 (s, 4H), 7.26 (dd), 7.32 (br s, C₆H₅), 7.66 (dt), 8.43-8.60 (m, 2H)

REFERENCE EXAMPLE 9

1,1-Dimethyl-2-(3-pyridylmethyl)hydrazine

In 100 ml of dry ethyl ether was suspended 4.6 g of lithium aluminumhydride and with stirring in a nitrogen gas stream, a solution of 12.0 gof 1,1-dimethyl-2-(3-pyridylmethylidene)hydrazine in 50 ml is of dryethyl ether was added dropwise. The mixture was refluxed for 5 hoursand, then, cooled (5° C.) and with stirring, 5 ml of water, 5 ml of 20%aqueous sodium hydroxide and 15 ml of water were added dropwise insuccession. The insoluble matter was filtered off, the filtrate wasconcentrated, and the residue was purified by silica gel columnchromatography (eluent: chloroformethanol=10:1). The resulting oil wasdistilled under reduced pressure to give 2.5 g of the title compound asa yellow oil.

b.p: 100-115° C./1 mmHg

NMR (CDCl₃) δ: 2.47 (s, NMe₂), 2.81 (br s, NH), 3.93 (s, CH₂ N)

REFERENCE EXAMPLE 10

2,6-Dichloro-3-pyridylmethylamine

(1) In 40 ml of DMF was suspended 3.9 g (0.021 mole) of potassiumphthalimide followed by addition of 3.9 g (0.02 mole) of2,6-dichloro-3-pyridylmethyl chloride and the mixture was stirred at60-70° C. for 2 hours. The DMF was distilled off under reduced pressureand the residue was diluted with 50 ml of water and extracted with CHCl₃(50 ml×3). The extract was dried over MgSO₄ and concentrated and theresulting precipitate was collected by filtration, washed with ether anddried to give 3.8 g of N-2,6-dichloro-3-pyridylmethyl)phthalimide aswhite prisms.

m.p.: 189-190° C.

NMR (CDCl₃) δ: 4.95 (s, 2H), 7.22 (d, J=8.5 Hz), 7.65 (d, J=8.5 Hz),7.66-8.0 (m, 4H)

(2) In a mixture of 50 ml EtOH and 20 ml DMF was dissolved 3.1 g (0.01mole) of N-(2,6-dichloro-3-pyridylmethyl)phthalimide under heating,followed by addition of 0.75 g (0.015 mole) of H₂ NNH₂ ·H₂ O underreflux. After 1 hour of refluxing, EtOH and DMF were distilled off. Tothe residue were added 10 ml of concentrated hydrochloric acid and 5 mlof water, and the mixture was refluxed for 30 minutes. The resultingcrystals were filtered off and the filtrate was neutralized with NaHCO₃and extracted with CH₂ Cl₂ (30 ml×3). The extract was dried over MGSO₄and the solvent was distilled off to give 1.45 g of the title compoundas a yellow oil.

NMR (CDCl₃) δ: 1.55 (s, 2H), 3.96 (s, 2H), 7.27 (d, J=8.5 Hz), 7.82 (d,J=8.5 Hz)

REFERENCE EXAMPLE 11

N-(2,6-Dichloro-3-pyridylmethyl)-N-methylamine

In 50 ml of acetonitrile was dissolved 7.8 g (0.1 mole) of 40% aqueousmethylamine and with stirring and ice-cooling, a solution of 3.9 g (0.02mole) of 2,6-dichloro-3-pyridylmethyl chloride in 10 ml of acetonitrilewas added dropwise over 5 minutes. After completion of the dropwiseaddition, the mixture was stirred at room temperature for 2 hours and,then, concentrated. The residue was extracted with ether (30 ml×3 ) anddried over MgSO₄. Finally, the solvent was distilled off to give 3.2 gof the title compound as a pale yellow oil.

NMR (CDCl₃) δ: 1.46 (s, NH), 2.46 (s, 3H), 3.82 (s, 2H), 7.26 (d, J=8.5Hz), 7.75 (d, J=8.5 Hz)

REFERENCE EXAMPLE 12

1-[N-(2,6-Dichloro-3-pyridylmethyl)-N-methyl]amino-1-methylthio-2-nitroethylene

The reaction according to Reference Example 4 was repeated except thatN-(2,6-dichloro-3-pyridylmethyl)-N-methylamine was used in lieu ofpiperidine. The procedure gave the title compound as yellow prisms.

m.p.: 111-112° C.

NMR (CDCl₃) δ: 2.46 (s, 3H), 3.12 (s, 3H), 4.84 (s, 2H), 6.79 (s, 1H),7.35 (d, J=8.5 Hz), 7.66 (d, J=8.5 Hz)

REFERENCE EXAMPLE 13

1,1-bis(Methylthio)-2-nitroethylene was reacted with various amines inthe same manner as Reference Example 4 to give the following compounds.

(1) 1-Dimethylamino-1-methylthio-2-nitroethylene (yellow oil)

NMR (CDCl₃) δ: 2.46 (s, 3H), 3.21 (s, 6 H), 6.69 (s, 1H)

(2) 1-(N-Ethyl-N-methyl)amino-1-methylthio-2-nitroethylene (yellow oil)

NMR (CDCl₃) δ: 1.27 (t, J=6.5 Hz, 3H), 2.48 (s, 3H), 3.13 (s, 3H), 3.64(q, J=6.5 Hz, 2H), 6.73 (s, 1H)

(3) 1-(4-Chlorobenzyl)amino-1-methylthio-2-nitroethylene (pale yellowcrystals)

m.p.: 121-123° C.

NMR (CDCl₃) δ: 2.43 (s, Me), 4.60 (d, J=6 Hz, CH₂), 6.59 (s, ═CHNO₂),7.23 & 7.36 (each d, J=9 Hz, each 2H, benzene-H₄), 10.71 (br, NH)

REFERENCE EXAMPLE 14

N-Methyl-N-[2-(3-pyridyl)ethyl]amine

(1) In 100 ml of CHCl₃ was dissolved 6.39 g (0.052 mole) of2-(3-pyridyl)ethanol followed by dropwise addition of 15.6 ml of thionylchloride with stirring at room temperature. Then, the mixture wasstirred for 1.5 hours, after which the solvent was distilled off. Afteraddition of ether, crystals were recovered by filtration and dried. Theprocedure gave 9.13 g of 2-(3-pyridyl)ethyl chloride hydrochloride aswhite crystals.

m.p.: 157-158° C.

NMR (DMSO-d₆) δ: 3.33 (t, J=7 Hz, CH₂ Cl), 4.02 (t, J=7 Hz, CH₂-pyridine), 8.10 (dd, J=6 & 8 Hz), 8.64 (m), 8.90 (d, J=6 Hz), 9.00 (d,J=2 Hz), 11.5 (br)

(2) To 32.6 g of 40% aqueous methylamine solution was added 7.48 g(0.042 mole) of 2-(3-pyridyl)ethyl chloride hydrochloride in smallportions with stirring. The mixture was transfered to a stainless steelreaction column and heated at an external temperature of 80° C. for 4hours. After cooling, 3.36 g of NaOH was added with ice-cooling andstirring and the mixture was saturated with sodium chloride andextracted with CH₂ Cl₂. The extract was dried over MgSO₄ and the CH₂ Cl₂was distilled off to give 6.32 g of the title compound in crude form asa yellow oil.

NMR (CDCl₃) δ: 1.58 (s, NH), 2.44 (s, NMe), 2.82 (m, CH₂ CH₂), 7.21 (dd,J=5 & 8 Hz, 1H), 7.55 (m, 1H), 8.47 (m, 2H)

REFERENCE EXAMPLE 15

Pyridine-4-aldehyde and pyridine-2-aldehyde were respectively reactedwith methylamine in the same manner as Reference Example 6 (1) to givethe following compounds.

(1) N-(4-Pyridylmethylidene)methylamine (yellow oil)

NMR (CDCl₃) δ: 3.52 (d, J=2 Hz, MeN), 7.53 (m, 2 H, pyridyl-H₂), 8.20(m, CH═N), 8.65 (m, 2H, pyridyl-H₂)

IR (neat): 1645, 1590, 1410, 995, 810 cm⁻¹

(2) N-(2-Pyridylmethylidene)methylamine (yellow oil)

NMR (CDCl₃) δ: 3.54 (d, J=2 Hz, MeN), 7.30 (m, 1 H, pyridine-H₁), 7.71(m, 1H, pyridine-H₁), 7.97 (m, 1H, pyridine-H₁), 8.40 (m, CH═N), 8.31(d, J=5 Hz, 1H, pyridine-H₁)

IR (neat): 1650, 1585, 1645, 1430, 990, 770 cm⁻¹

REFERENCE EXAMPLE 16

The compounds of Reference Example 15 (1) and (2) were respectivelyreacted in the same manner as Reference Example 6 (2) to give thefollowing compounds.

(1) N-Methyl-N-(4-pyridylmethyl)amine (yellow brown oil)

NMR (CDCl₃) δ: 1.86 (br s, NH), 2-44 (s, Me), 3.76 (s, CH₂), 7.30 (m,2H, pyridine-H₂), 8.53 (m, 2H, pyridine-H₂)

IR (neat): 3260, 1600, 1440, 1410, 790 cm⁻¹

(2) N-Methyl-N-(2-pyridylmethyl)amine (orange-colored oil)

NMR (CDCl₃) δ: 2.48 (s, Me), 3.87 (s, CH₂), 7.0-7.4 (m, 2H,pyridine-H₂), 7.64 (t, J=8 Hz, 1H, pyridine-H₁), 8.56 (d, J=4 Hz,pyridine-H₁)

IR (neat): 1590, 1570, 1470, 1430, 755 cm⁻¹

REFERENCE EXAMPLE 17

N-(6-Chloro-3-pyridylmethyl)-N-ethylamine

Using 6-chloro-3-pyridylmethyl chloride and 70% aqueous ethylaminesolution, the reaction according to Reference Example 11 was carried outto give the title compound as a brown oil.

NMR (CDCl₃) δ: 1.11 (t, J=7 Hz, CH₂ CH₃), 1.43 (s, NH), 2.68 (q, J=7 Hz,CH₂ CH₃), 3.79 (s, CH₂ -pyridine), 7.28 (d, J=8 Hz, 1H), 7.71 (dd, J=2 &8 Hz, 1H), 8.33 (d, J=2 Hz, 1H)

IR (neat): 1595, 1565, 1460 (sh), 1450, 1380, 1100 cm⁻¹

REFERENCE EXAMPLE 18

O-Methyl-N-(3-pyridylmethyl)hydroxylamine

In 200 ml of acetonitrile was suspended 6.6 g (0.04 mole) of3-pyridylmethyl chloride hydrochloride, followed by addition of 10 g(0.12 mole) of O-methylhydroxyloamine hydrochloride and 16.2 g (0.16mole) of triethylamine. The mixture was stirred at 50° C. for 15 hours.The insoluble matter was filtered off and the filtrate was concentrated.The residue was subjected to silica gel column chromatography, usingEtOH-CHCl₃ (1:10) as an eluent. The procedure gave 1.0 g of the titlecompound as a yellow oil.

NMR (CDCl₂) δ: 3.47 (s, 3H), 4.05 (s, 2H), 5.73 (br, NH), 7.27 (dd, J=8& 5 Hz, 1H), 7.73 (dt, J=8 & 2 Hz, 1H), 8.50-8.70 (m, 2H)

IR (neat): 3200, 1580, 1425, 710 cm⁻¹

REFERENCE EXAMPLE 19

(2-Methoxy)ethyl isothiocyanate

In 70 ml of water was dissolved 4.6 g (0.11 mole) of NaOH. Then, 6.4 ml(0.11 mole) of carbon disulfide was added with vigorous stirring and 8.0g (0.11 mole) of 2-methoxyethylamine was added gradually in droplets.The mixture was stirred at 70° C. for 2 hours, after which 8.2 ml (0.11mole) of methyl chloroformate was added dropwise at room temperature.The mixture was stirred at 50° C. for 1 hour. The oil separated from theaqueous layer was extracted with ether and dried over MgSO₄. The etherwas distilled off and the residue was distilled under reduced pressureto give 7.6 g of the title compound as a colorless oil.

b.p: 77-80° C./22 mmHg

NMR (CDCl₃) δ: 3.41 (s, 3H), 3.4-3.8 (m, 4H)

IR (neat): 2080, 1720, 1340 cm⁻¹

REFERENCE EXAMPLE 20

6-Chloro-3-pyridylmethyl chloride and 6-chloro-3-pyridylmethyl chloridehydrochloride

(1) In 70 ml of MeOH was suspended 12.0 g (0.086 mole) of6-hydroxynicotinic acid followed by addition of 4 ml of concentrated H₂SO₄. The mixture was refluxed for 10 hours. After cooling, MeOH wasdistilled off and the residue was adjusted to pH about 8 with asaturated aqueous solution of sodium hydrogen carbonate. The precipitatewas collected by filtration, rinsed (twice) with water and dried to give10.5 g of methyl 6-hydroxynicotinate as pale yellow crystals. Thisproduct was in the pyridone structure.

NMR (DMSO-d₆) δ: 3.77 (s, 3H), 6.38 (d, J=10 Hz, 1H), 7.80 (dd, J=10 & 3Hz, 1H), 8.05 (d, J=3 Hz, 1H), 11 (br)

(2) In 100 ml of acetonitrile was dissolved 4.0 g (0.026 mole) of methyl6-hydroxynicotinate followed by addition of 0.9 ml of triethylamine. Themixture was refluxed and 3.7 ml of phosphorus oxychloride was addeddropwise with stirring over a period of 15 minutes. The mixture wasfurther refluxed for 3 hours. After cooling, the acetonitrile wasdistilled off and the residue was diluted with 20 ml of water andadjusted to pH about 8 with a saturated aqueous solution of sodiumhydrogen carbonate. The resulting crystals are collected by filtration,rinsed with water and dried to give 3.6 g of methyl 6-chloronicotinateas pale yellow needles.

m.p.: 87-88° C.

MNR (CDCl₃) δ: 3.97 (s, 3H), 7.44 (d, J=8 Hz, 1H), 8.27 (dd, J=8 & 2 Hz,1H). 9.02 (d, J=2 Hz, 1H)

IR (Nujol): 1715, 1585, 1440, 1290, 1280, 1125 cm⁻¹

(3) To a mixture of 3.0 g (0.0175 mole) of methyl 6-chloronicotinate,2.0 g of sodium borohydride and 60 ml of THF on reflux, 8.0 ml of MeOHwas added with stirring over a period of 1 hour. After completion of thedropwise addition, the mixture was further refluxed for 30 minutes andwhen cold, the solvent was distilled off. The residue was diluted with30 ml of water, saturated with NaCl and extracted with CH₂ Cl.sub.₂ (20ml×3). The CH₂ Cl.sub.₂ layer was dried over MgSO₄ and the CH₂ Cl₂ wasdistilled off to give 2.3 g of 6-chloro-3-pyridylmethanol as a yellowoil. When left standing at room temperature, this product was thoroughlycrystallized.

NMR (CDCl₃) δ: 2.89 (br, 1H), 4.69 (s, 2H), 7.28 (d, J=9 Hz, 1H), 7.69(dd, J=9 & 3 Hz, 1H), 8.28 (d, J=3 Hz, 1H)

(4) In 500 ml of CHCl₃ was dissolved 47.3 g (0.33 mole) of6-chloro-3-pyridylmethanol followed by dropwise addition of 99.3 ml ofthionyl chloride with stirring at room temperature. After completion ofthe dropwise addition, the mixture was further stirred for 1.5 hoursand, then, allowed to stand overnight. The CHCl₃ was distilled off underreduced pressure, whereby crystals and oil were obtained as a residue.The residue was diluted with ether, collected by filtration and dried togive 45.2 g of 6-chloro-3-pyridylmethyl chloride hydrochloride as whitecrystals.

NMR (DMSO-d₆) δ: 4.82 (s, 2H), 7.51 (d, J=8 Hz, 1 H), 7.97 (dd, J=8 & 2Hz, 1H), 8.50 (d, J=2 Hz, 1H)

The mother liquor remaining after separation of the above crop ofcrystals was concentrated and the insoluble residue was dissolved inEtOH, diluted with toluene and concentrated. The above procedure wascarried out for a total of 3 times to recover 9.04 g of crude6-chloro-3-pyridylmethyl chloride as an oil. (5) In 50 ml of water wassuspended 15.0 g (0.076 mole) of 6-chloro-3-pyridylmethyl chloridehydrochloride and the suspension was adjusted to pH about 8 with asaturated aqueous solution of sodium hydrogen carbonate. The resultingmixture was extracted with ether (100 ml×3) and dried over MgSO₄. Theether was then distilled off under reduced pressure to give acrystalline residue. After addition of hexane, the crystals wererecovered by filtration, washed with hexane and dried to give 11.0 g of6-chloro-3-pyridylmethyl chloride as white prisms.

m.p.: 39-40° C.

NMR (CDCl₃) δ: 4.56 (s, 2H), 7.35 (d, J=8 Hz, 1H), 7.73 (dd, J=8 & 2 Hz,1H), 8.40 (d, J=2 Hz, 1H)

IR (Nujol): 1585, 1445, 1280, 1135, 1105, 820, 740 cm⁻¹

REFERENCE EXAMPLE 21

N-Methyl-N-(2-pyrazinyl)methylamine

(1) In 300 ml of CCl₄ was dissolved 9.4 g (0.1 mole) of 2-methylpyrazinefollowed by addition of 13.4 g of N-chlorosuccinimide and 0.5 g ofbenzoyl peroxide. The mixture was refluxed for 24 hours. After cooling,the insoluble matter was filtered off and the filtrate was concentratedto give 11.0 g of 2-chloromethylpyrazine as oil.

NMR (CDCl₃) δ: 4.73 (s, 2H), 8.36-8.70 (m, 2H), 8.80 (s, 1H)

(2) The reaction according to Reference Example 11 was carried out using2-chloromethylpyrazine in lieu of 2,6-dichloro-3-pyridylmethyl chlorideto give the title compound as oil.

NMR (CDCl₃) δ: 2.50 (s, 3H), 2.63 (br, 1H), 3.93 (s, 2H), 8.45-8.60 (m,2H), 8.63 (s, 1H)

REFERENCE EXAMPLE 22

1-[N-(6-Chloro-3-pyridylmethyl)-N-n-propyl]amino-1-methylthio-2-nitroethylene

(1) In 15 ml of acetonitrile was dissolved 6.05 g (0.0373 mole) of6-chloro-3-pyridylmethyl chloride, and under cooling with ice-water andstirring, the solution was added dropwise to a solution of 10.97 g ofn-propylamine in 50 ml of acetonitrile. After completion of the dropwiseaddition, the mixture was stirred at room temperature for 1 hour and atan external temperature of 50° C. for an additional 1 hour. Theacetonitrile was distilled off and the residue was diluted with aqueoussodium hydrogen carbonate solution and extracted with CH₂ Cl₂ (100ml×3). The extract was dried over MgSO₄ and distilled to remove CH₂ Cl₂,whereby 6.94 g of N-(6-chloro-3-pyridylmethyl)-N-n-propylamine wasobtained as a yellow-brown oil.

NMR (CDCl₃) δ: 0.90 (t, J=7 Hz, CH₂ CH₃), 1.32 (s, NH), 1.52 (sextet,J=7 Hz, CH₂ CH₃), 2.59 (t, J=7 Hz, NCH₂ CH₂) 3.79 (s, CH₂ -pyridine),7.29 (d, J=8 Hz, 1H), 7.71 (dd, J=8 & 2 Hz, 1H), 8.35 (d, J=2 Hz, 1H)

(2) In 100 ml of EtOH was dissolved 4.47 g of1,1-bis(methylthio)-2-nitroethylene under heating at the refluxtemperature. Then, with stirring and refluxing, a solution of 3.50 g(0.0190 mole) of N-(6-chloro-3-pyridylmethyl)-N-n-propylamine in 15 mlof EtOH was added dropwise and the mixture was further refluxed for 12.5hours. The reaction mixture was allowed to stand at room temperatureovernight and the resulting crystals were filtered off. The filtrate wasconcentrated and the residue was subjected to silica gel (250 g) columnchromatography using EtOH-CHCl₃ (1:20) as an eluent. The procedure gave2.98 g of the title compound as a yellow viscous oil.

NMR (CDCl₃) δ: 0.90 (t, J=7 Hz, CH₂ CH₃), 1.68 (sextet, J=7 Hz, CH₂CH₃), 2.46 (s, MeS), 3.42 (t, J=7 Hz, NCH₂ CH₂), 4.70 (s, CH₂-pyridine), 6.80 (s, ═CHNO₂), 7.36 (d, J=8 Hz, 1H), 7.61 (dd, J=8 & 2Hz, 1H), 8.29 (d, J=2 Hz, 1H)

REFERENCE EXAMPLE 23

1-[N-(6-Chloro-3-pyridylmethyl)-N-i-propyl]amino-1-methylthio-2-nitroethylene

The reactions according to (1) and (2) of Reference Example 22 werecarried out using i-propylamine in lieu of n-propylamine to give thefollowing compounds at the respective steps.

(1) N-(6-Chloro-3-pyridylmethyl)-N-i-propylamine (oil)

NMR (CDCl₃) δ: 1.07 (d, J=6 Hz, Me₂ CH), 1.21 (br s, NH), 2.84 (septet,J=6 Hz, CHMe₂), 3.77 (s, CH₂), 7.28 (d, J=8 Hz, 1H), 7.71 (dd, J=8 & 2Hz, 1H), 8.35 (d, J=2 Hz, 1H)

(2) Title compound (viscous oil)

NMR (CDCl₃) δ: 1.35 (d, J=7 Hz, CHMe₂), 2.38 (s, MeS), 4.64 (s, CH₂),6.57 (s, ═CHNO₂)

REFERENCE EXAMPLE 24

2-Chloro-5-methylaminopyridine

To 5.0 g (0.039 mole) of 5-amino-2-chloropyridine was added 40 ml ofethyl orthoformate and the mixture was refluxed for 5 hours. Thereaction mixture was concentrated under reduced pressure and the residuewas dissolved in 50 ml of EtOH. After addition of 1.8 g of sodiumborohydride, the mixture was stirred at 70-80° C. for 3 hours. Thereaction mixture was concentrated and after addition of 50 ml of icedwater and 5 ml of concentrated hydrochloric acid, the mixture wasadjusted to pH 7-8 with NaHCO₃ and extracted with AcOEt (50 ml×3). TheAcOEt layers were pooled, washed with water and dried over MgSO₄. TheAcOEt was distilled off and hexane was added to the crystalline residue.The crystals are collected by filtration, washed with hexane and driedto give 5.1 g of the title compound as white crystals.

m.p.: 70° C.

NMR (CDCl₃) δ: 2.85 (br d, J=4.5 Hz, 3 H), 3.3-4.3 (m, 1 H), 6.87 (dd,J=8.0 & 3.0 Hz, 1 H), 7.11 (d, J=8.7 Hz, 1 H), 7.78 (d, J=3.3 Hz, 1 H).

REFERENCE EXAMPLE 25 N-(2,6-Dimethyl-4-pyridylmethyl)-N-methylamine

(1) In 77 ml of CHCl₃ was dissolved 7.00 g (0.0511 mole) of(2,6-dimethyl-4-pyridyl)methanol and with stirring at room temperature,15.3 ml of thionyl chloride was added dropwise. After completion of thedropwise addition, the mixture was stirred for 3 hours and concentrated.The residue was diluted with aqueous sodium hydrogen carbonate solutionand extracted with AcOEt (100 ml×3) The extract was dried over MgSO₄ anddistilled to remove AcOEt. The procedure gave 6.37 g of(2,6-dimethyl-4-pyridyl)methyl chloride as oil.

NMR (CDCl₃) δ: 2.53 (s, Me×2), 4.45 (s, CH₂), 6.98 (s, pyridine-H₂)

(2) The reaction according to Reference Example 11 was carried out using(2,6-dimethyl-4-pyridyl)methyl chloride in lieu of2,6-dichloro-3-pyridylmethyl chloride to give the title compound as oil.

NMR (CDCl₃):2.44 (s, NMe), 2.50 (s, pyridine-Me×2), 3.68 (s, CH₂) 6.94(s, pyridine-H₂)

REFERENCE EXAMPLE 26 N-(2-Chloro-3-pyridylmethyl)-N-methylamine

(1) To 10.24 g (0.065 mole) of 2-chloronicotinic acid were added 20 mlof 1,2-dichloroethane and 9.5 ml of thionyl chloride and the mixture wasrefluxed for 1 hour. The reaction mixture was concentrated to give 11.9g of 2-chloronicotinyl chloride as an orange-colored oil. When leftstanding at room temperature, this product solidified thoroughly.

NMR (CDCl₃) δ: 7.54 (dd, J=8 & 5 Hz, 1 H), 8.48 (dd, J=8 & 1 Hz, 1 H),8.65 (dd, J=5 & 1 Hz, 1 H)

(2) In 100 ml of cold water was dissolved 8.98 g of sodium borohydrideand with ice-cooling and stirring, 11.7 g (0.0665 mole) of2-chloronicotinyl chloride was added in small portions. The mixture wasfurther stirred at the same temperature for 30 minutes and, then,extracted with Et₂ O (100 ml×3). The extract was dried over MgSO₄ anddistilled to remove Et₂ O. The procedure gave 8.75 g of(2-chloro-3-pyridyl)methanol as a pale yellow oil. When left standing atroom temperature, this product solidified thoroughly.

NMR (CDCl₃) δ: 4.53 (br, OH), 4.77 (s, CH₂), 7.30 (m, 1 H), 7.97 (m, 1H), 8.25 (m, 1 H)

(3) The reaction according to Reference Example 25 (1) was carried outusing (2-chloro-3-pyridyl)methanol in lieu of(2,6-dimethyl-4-pyridyl)methanol to give (2-chloro-3-pyridyl)methylchloride as a yellow oil.

NMR (CDCl₃) δ: 4.71 (s, CH₂), 7.31 (dd, J=8 & 5 Hz, 1 H), 7.88 (dd, J=8& 2 Hz, 1 H) 8.33 (dd, J=5 & 2 Hz, 1 H)

(4) The reaction according to Reference Example 11 was carried out using(2-chloro-3-pyridyl)methyl chloride in lieu of2,6-dichloro-3-pyridylmethyl chloride to give the title compound as ayellow oil.

NMR (CDCl₃) δ: 1.95 (s, NH), 2.47 (s, Me), 3.84 (s, CH₂), 7.26 (dd, J=8& 5 Hz, 1 H), 7.80 (dd, J=8 & 2 Hz, 1 H), 8.30 (dd, J=5 & 2 Hz, 1 H)

REFERENCE EXAMPLE 27 2-Methyl-5-methylaminopyridine oxalate

To 5.0 g (0.04 mole) of 5-amino-2-methylpyridine was added 40 ml ofethyl orthoformate and the mixture was refluxed for 1 hour. The reactionmixture was concentrated under reduced pressure and the residue wasdissolved in 50 ml of EtOH, followed by addition of 2.1 g of sodiumborohydride. The mixture was refluxed with stirring for 2.5 hours. Thereaction mixture was concentrated and 50 ml of ice-water and 8 ml ofconcentrated hydrochloric acid were added to the residue. The mixturewas adjusted to pH 7 with NaHCO₃ and extracted with AcOEt (50 ml, 30ml×2). The AcOEt layers were combined, washed with aqueous sodiumchloride solution and dried over MgSO₄. The AcOEt was distilled off andthe residue was diluted with Et₂ O and the insoluble matter was filteredoff. To the filtrate was added a solution of oxalic acid in EtOH (ca.10%) and the resulting crystals were collected by filtration, washedwith EtOH and dried. The procedure gave 4.3 g of the title compound aspale yellow crystals.

m.p.: 118.5-119.5° C.

NMR (DMSO-d₆) δ: 2.43 (3 H, s), 2.73 (3 H, s), 7.1-7.5 (2 H, m), 7.8-8.0(1 H, m), 8.2-9.0 (m)

REFERENCE EXAMPLE 28 N-(5-Bromo-3-pyridylmethyl)-N-methylamine

The steps (1), (2), (3) and (4) of Reference Example 26 were repeatedexcept that 5-bromonicotinic acid was used in lieu of 2-chloronicotinicacid to obtain the following compounds in the respective steps.

(1) 5-Bromonicotinyl chloride (white crystals)

NMR (CDCl₃) δ: 8.54 (m, 1 H), 8.99 (d, J=1 Hz, 1 H), 9.25 (d, J=1 Hz, 1H)

(2) (5-Bromo-3-pyridyl)methanol (crude orange-colored oil)

NMR (CDCl₃) δ: 4.39 (br s, OH), 4.73 (s, CH₂), 7.90 (m, 1 H), 8.47 (d,J=1 Hz, 1 H), 8.55 (d, J=2 Hz, 1 H)

(3) (5-Bromo-3-pyridyl)methyl chloride (crude oil)

NMR (CDCl₃) δ: 4.57 (s, CH₂), 7.92 (m, 1 H), 8.56 (d, J=1 Hz, 1 H), 8.65(d, J=1 Hz, 1 H)

(4) Title compound (crude oil)

NMR (CDCl₃) δ: 2.44 (s, Me), 3.76 (s, CH₂), 7.89 (m, 1 H), 8.48 (d, J=1Hz, 1 H), 8.57 (d, J=1 Hz, 1 H)

REFERENCE EXAMPLE 29 N-(2-Methylthio-3-pyridylmethyl)-N-methylamine

The steps (1), (2), (3) and (4) of Reference Example 26 were repeatedexcept that 2-methylthionicotinic acid was used in lieu of2-chloronicotinic acid to obtain the following compounds in therespective steps.

(1) 2-Methylthionicotinyl chloride (white--pale yellow crystals)

NMR (CDCl₃) δ: 2.56 (s, MeS), 7.17 (dd, J=5 & 8 Hz, 1 H), 8.52 (dd, J=8& 2 Hz, 1 H), 8.67 (dd, J=5 & 2 Hz, 1 H)

(2) (2-Methylthio-3-pyridyl)methanol (pale yellow oil, crystallizedthoroughly on standing)

NMR (CDCl₃) δ: 2.56 (s, MeS), 3.46 (br s, OH), 4.62 (s, CH₂), 6.99 (dd,J=5 & 8 Hz, 1 H), 7.62 (dd, J=8 & 1 Hz, 1 H), 8.33 (dd, J=5 & 8 Hz, 1 H)

(3) (2-Methylthio-3-pyridyl)methyl chloride (pale yellow oil)

NMR (CDCl₃) δ: 2.61 (s, MeS), 4.60 (s, CH₂), 6.99 (dd, J=5 & 8 Hz, 1 H),7.58 (dd, J=8 & 2 Hz, 1 H), 8.43 (dd, J=5 & 2 Hz, 1 H)

(4) Title compound (yellow oil)

NMR (CDCl₃) δ: 1.50 (s, NH), 2.44 (s, MeN), 2.57 (s, MeS), 3.73 (s,CH₂), 6.97 (dd, J=5 & 8 Hz, 1 H), 7.51 (dd, J=8 & 1 Hz, 1 H), 8.37 (dd,J=5 & 1 Hz, 1 H)

REFERENCE EXAMPLE 30 N-Methyl-N-(4-thiazolyl)methylamine

(1) The reaction procedure of Reference Example 21 (1) was repeatedexcept that 4-methylthiazole was used in lieu of 2-methylpyrazine togive crude 4-chloromethyl-thiazole as oil.

NMR (CDCl₃) δ: 4.72 (s, CH₂ Cl), 7.37 (m, 1 H), 8.78 (d, J=2 Hz, 1 H)

(2) The reaction procedure of Reference Example 11 was repeated exceptthat crude 4-chloromethylthiazole was used in lieu of2,6-dichloro-3-pyridylmethyl chloride and the reaction Was conducted atroom temperature for 1 hour and further at 50° C. for 2 hours. Theprocedure gave the title compound as a crude oil.

NMR (CDCl₃) δ: 2.43 (s, MeN), 3.89 (s, CH₂), 7.17 (m, 1 H), 8.74 (d, J=2Hz, 1 H)

REFERENCE EXAMPLE 31 2-Chloro-5-ethylaminopyridine

A mixture of 10 g (0.078 mole) of 5-amino-2-chloro-pyridine and 50 ml ofethyl orthoacetate was refluxed for 2 hours. The reaction mixture wasconcentrated under reduced pressure and the residue was dissolved in 60ml of dry THF. Then, the solution was added dropwise to a suspension of7.0 g of lithium borohydride in 100 ml of dry THF over a period of 15minutes with constant stirring. After completion of dropwise addition,the mixture was refluxed with stirring for 27 hours. After cooling, thesolvent was distilled off. To the residue were added 100 ml of ice-waterand 35 ml of concentrated hydrochloric acid and the mixture was heatedat 67° C. for a while. After cooling, the reaction mixture was adjustedto pH 7 with NaHCO₃ and extracted with AcOEt (50 ml×3). The AcOEt layerswere combined, washed with aqueous sodium chloride solution and driedover MgSO₄. The AcOEt was distilled off and the residual crystals werecollected by filtration, washed with hexane and dried. The proceduregave 9.2 g of the title compound as pale yellowish green crystals.

m.p.: 65-66° C.

NMR (CDCl₃) 67 :1.25 (3 H, t, J=7.4 Hz), 2.9-3.4 (2 H, m), 3.4-4.1 (1 H,m, NH), 6.86 (1 H, dd, J=9.0 & 3.0 Hz), 7.09 (1 H, d, J=7.8 Hz), 7.77 (1H, d, J=2.7 Hz).

REFERENCE EXAMPLE 32 2-Chloro-5-n-propylaminopyridine

(1) To 6.4 g (0.05 mole) of 5-amino-2-chloropyridine was added 25 g oftriethyl orthopropionate and the mixture was refluxed for 3 hours. Then,at an external temperature of 70° C., the reaction mixture wasconcentrated under reduced pressure using a vacuum pump. The proceduregave 10.5 g of N-(6-chloro-3-pyridyl)-O-ethylpropionimidate as a yellowoil.

NMR (CDCl₃) δ: 1.07 (t, J=8 Hz, 3 H), 1.33 (t, J=7 Hz, 3 H), 2.16 (q,J=8 Hz, 2 H), 4.22 (q, J=7 Hz, 2 H), 7.06 (dd, J=8 & 3 Hz, 1 H), 7.25(d, J=8 Hz, 1 H), 7.87 (d, J=3 Hz, 1 H)

(2) To a 70% solution of sodium dihydro-bis(2-methoxy-ethoxy)aluminatein toluene was added 100 ml of toluene and a solution of 8.5 g (0.04mole) of N-(6-chloro-3-pyridyl)-O-ethylpropionimidate in 20 ml oftoluene was added dropwise over 5 minutes with stirring at roomtemperature. The mixture was further stirred at room temperature for 1hour and at 50° C. for 2 hours, after which 50 ml of water was addeddropwise over 5 minutes under ice-cooling. The mixture was stirred at50° C. for 15 minutes. The toluene layer was separated, dried over MgSO₄and concentrated and the residue was subjected to silica gel columnchromatography using hexane-acetone (2:1) as the eluent. The proceduregave 5.9 g of the title compound as a yellow oil.

NMR (CDCl₃) δ: 0.99 (t, J=7 Hz, 3 H), 1.65 (m, 2 H), 3.07 (dt, J=7 & 6Hz, 2 H), 3.83 (br, 1 H), 6.86 (dd, J=8 & 3 Hz, 1 H), 7.10 (d, J=8 Hz, 1H), 7.77 (d, J=3 Hz, 1 H)

REFERENCE EXAMPLE 33 2-Chloro-5-n-butylaminopyridine

The steps (1) and (2) of Reference Example 32 were repeated except thattrimethyl orthobutyrate was used in lieu of triethyl orthopropionate toobtain the following compounds in the respective steps.

(1) N-(6-Chloro-3-pyridyl)-O-methyl butyrimidate (yellow oil)

NMR (CDCl₃) δ: 0.85 (t, J=7 Hz, 3 H), 1.33-1.80 (m, 2 H), 2.16 (t, J=7Hz, 2 H), 3.80 (s, 3 H), 7.06 (dd, J=8 & 3 Hz, 1 H), 7.27 (d, J=8 Hz, 1H), 7.88 (d, J=3 Hz, 1 H)

(2) Title compound (yellow crystals)

m.p.: 46-48° C.

NMR (CDCl₃) δ: 0.93 (t, J=7 Hz, 3 H), 1.16-1.83 (m, 4 H), 3.08 (dt, J=7& 6 Hz, 2 H), 3.78 (br, 1 H), 6.84 (dd, J=8 & 3 Hz, 1 H), 7.08 (d, J=8Hz, 1 H), 0.75 (d, J=3 Hz, 1 H)

REFERENCE EXAMPLE 34 3-Methylamino-5-trifluoromethylpyridine

The reaction procedure of Reference Example 24 was repeated except that3-amino-5-trifluoromethylpyridine was used in lieu of5-amino-2-chloropyridine to obtain the title compound as white crystals.

m.p. : 69-70° C.

NMR (CDC₃):2.89 (3 H, d, J=5.1 Hz), 3.8-4.5 (1 H, m, NH, 6.9-7.1 (1 H,m), 8.1-8.3 (2 H, m)

REFERENCE EXAMPLE 35 N-Methyl-N-(6-methyl-3-pyridylmethyl)amine

(1) The reaction procedure of Reference Example 20 (3) was repeatedexcept that methyl 6-methylnicotinate was used in lieu of methyl6-chloronicotinate to give crude 6-methyl-3-pyridylmethanol as a yellowoil.

NMR (CDCl₃) δ: 2.49 (s, Me), 4.66 (s, CH₂), 4.93 (br, OH), 7.14 (d, J=8Hz, 1 H), 7.63 (dd, J=8 & 2 Hz, 1 H), 8.36 (d, J=2 Hz, 1 H)

(2) The reaction procedure of Reference Example 25 (1) was repeatedexcept that crude 6-methyl-3-pyridyl-methanol was used in lieu of(2,6-dimethyl-4-pyridyl)-methanol to give crude(6-methyl-3-pyridyl)methyl chloride as oil.

NMR (CDCl₃) δ: 2.54 (s, Me), 4.55 (s, CH₂), 7.16 (d, J=8 Hz, 1 H), 7.62(dd, J=8 & 2 Hz, 1 H), 8.49 (dd, J=2 Hz, 1 H)

(3) A mixture of 16.6 g of 40% aqueous MeNH₂ solution and 52 ml of CH₃CN was cooled with ice and 6.08 g (0.043 mole in terms of pure product)of crude (6-methyl-3-pyridyl)-methyl chloride was added dropwise withconstant stirring. After completion of dropwise addition, the mixturewas stirred at room temperature for 1.5 hours, at the end of which timethe solvent was distilled off. The solid residue was extracted with CH₂Cl₂ and the CH_(Cl) ₂ layer was dried over MgSO₄. The CH₂ Cl₂ wasdistilled off and the residue was diluted with 70 ml of Et₂ O andfiltered to remove the insoluble matter. Finally the filtrate wasconcentrated to recover 4.60 g of the title compound as a crude oil.

NMR (CDCl₃) δ: 2.43 (s, MeN), 2.53 (s, pyridine-Me), 3.71 (s, CH₂), 7.13(d, J=8 Hz, 1 H), 7.57 (dd, J=8 & 2 Hz, 1 H), 8.40 (d, J=2 Hz, 1 H)

REFERENCE EXAMPLE 36 N-(6-Fluoro-3-pyridylmethyl)-N-methylamine

(1) A mixture of 7.2 g (0.0648 mole) of 2-fluoro-5-methylpyridine, 12.0g of N-bromosuccinimide, 0.5 g of benzoyl peroxide and 200 ml of CCl₄was refluxed for 2 hours. After cooling, the precipitate was filteredoff and the filtrate was washed with water and dried. Finally, the CCl₄was distilled off to recover 12.68 g of crude (6-fluoro-3-pyridyl)methylbromide as a pale yellow oil.

NMR (CDCl₃) δ: 4.47 (2 H, s, CH₂), 6.96 (1 H, dd, J=8.4 & 2.7 Hz), 7.86(1 H, ddd, J=8.4, 2.4 & 8.4 Hz), 8.29 (1 H, d, J=2.4 Hz)

(2) To a mixture of 2.5 g of 40% aqueous methylamine solution and 30 mlof CH₃ CN was added dropwise 3.0 g of crude (6-fluoro-3-pyridyl)methylbromide with constant stirring. The mixture was allowed to stand at roomtemperature overnight and concentrated under reduced pressure. Theresidue was extracted with AcOEt and the extract was dried over MgSO₄and concentrated. The procedure gave 1.35 g of the title compound as acrude orange-colored oil.

NMR (CDCl₃) δ: 2.53 (3 H, s, Me), 3.94 (2 H, s, CH₂) 5.40 (1 H, s, NH)

REFERENCE EXAMPLE 37 N-(6-Bromo-3-pyridylmethyl)-N-methylamine

(1) The reaction procedure of Reference Example 36 (1) was repeatedexcept that 2-bromo-5-methylpyridine was used in lieu of2-fluoro-5-methylpyridine to recover crude (6-bromo-3-pyridyl)methylbromide as a yellow oil.

NMR (CDCl₃) 67 :4.42 (2 H, s), 7.48 (1 H, d, J=8.4 Hz), 7.61 (1 H, dd,J=8.4 & 2.7 Hz), 8.40 (1 H, d, J=2.7 Hz).

(2) To a mixture of 12.3 g of 40% aqueous methylamine solution and 40 mlof CH₃ CN was added 8.0 g of crude (6-bromo-3-pyridyl)methyl bromidewith stirring. The mixture was further stirred at room temperature for30 minutes. The reaction mixture thus obtained was concentrated and theresidue was diluted with toluene and subjected to azeotropicdistillation to remove the water. Then, the soluble fraction wasextracted with Et₂ O. The Et₂ O layer was dried over MgSO₄ andconcentrated to recover 4.4 g of the title compound as a yellow oil.

NMR (CDCl₃) δ: 2.48 (3 H, s), 2.73 (1 H, s), 3.80 (2 H, s), 7.45 (1 H,d, J=8.4 Hz), 7.63 (1 H, dd, J=8.4 & 2.7 Hz), 8.36 (1 H, d, J=2.7 Hz)

REFERENCE EXAMPLE 38 N-(6-Bromo-3-pyridylmethyl)-N-ethylamine

The reaction procedure of Reference Example 37 (2) was repeated exceptthat 70% aqueous ethylamine solution was used in lieu of 40% aqueousmethylamine solution to recover the title compound as a crude oil.

NMR (CDCl₃) δ: 1.11 (3 H, t, J=8.1 Hz), 2.16 (1 H, br s), 2.68 (2 H, q,J=8.1 Hz), 3.78 (2 H, s), 7.45 (1 H, d, J=8.4 Hz), 7.58 (1 H, dd, J=8.4& 2.7 Hz), 8.33 (1 H, d, J=2.7 Hz)

REFERENCE EXAMPLE 39 N-(2-Chloro-5-thiazolylmethyl)-N-methylamine

The reaction procedure of Reference Example 11 was repeated except thatcrude 2-chloro-5-chloromethyl-thiazole was used in lieu of2,6-dichloro-3-pyridylmethyl chloride and that CH₂ Cl₂ was used as theextractant. The procedure gave the title compound as a crude oil.

NMR (CDCl₃) δ: 2.45 (s, MeN), 3.89 (s, CH₂), 7.37 (s, thiazole-H)

REFERENCE EXAMPLE 40 N-(2-Chloro-5-thiazolylmethyl)-N-ethylamine

The reaction procedure of Reference Example 17 was repeated except thatcrude 2-chloro-5-chloromethylthiazole was used in lieu of6-chloro-3-pyridylmethyl chloride and that CH₂ Cl₂ was used as theextractant. The procedure gave the title compound as a crude oil.

NMR (CDCl₃) δ: 1.10 (t, J=7 Hz, CH₂ CH₃), 2.69 (q, J=7 Hz, CH₂ CH₃),3.93 (s, CH₂ N), 7.36 (s, thiazole-H)

REFERENCE EXAMPLE 41 2-Chloro-5-thiazolylmethylamine

(1) The reaction procedure of Reference Example 10 (1) was repeatedexcept that crude 2-chloro-5-chloromethylthiazole was used in lieu of2,6-dichloro-3-pyridylmethyl chloride to giveN-(2-chloro-5-thiazolylmethyl)-phthalimide as pale yellow crystals.

m.p.: 108-109° C.

NMR (CDCl₃) δ: 4.97 (2 H, s), 7.60 (1 H, s), 7.6-8.1 (m, 4 H)

(2) The reaction procedure of Reference Example 3 was repeated exceptthat N-(2-chloro-5-thiazolylmethyl)-phthalimide was used in lieu ofN-(6-chloro-3-pyridylmethyl)phthalimide to give the title compound as ayellow oil.

NMR (CDCl₃) δ: 1.68 (2 H, br s), 4.04 (2 H, s), 7.38 (1 H, s)

REFERENCE EXAMPLE 42 2-Methoxy-5-methylaminopyridine

The reaction procedure of Reference Example 24 was repeated except that5-amino-2-methoxypyridine was used in lieu of 5-amino-2-chloropyridineto give the title compound as a yellow oil.

NMR (CDCl₃) δ: 2.81 (3 H, s), 3.1-3.8 (1 H, m), 3.87 (3 H, s), 6.64 (1H, d, J=9.0 Hz), 6.98 (1 H, dd, J=8.7 & 3.2 Hz), 7.59 (1 H, d, J=2.4 Hz)

REFERENCE EXAMPLE 43 6-Bromo-3-pyridylmethylamine

(1) The reaction procedure of Reference Example 10 (1) was repeatedexcept that crude 6-bromo-3-pyridylmethyl bromide was used in lieu of2,6-dichloro-3-pyridylmethyl chloride, to giveN-(6-bromo-3-pyridylmethyl)phthalimide as white crystals.

m.p.: 130-131° C.

NMR (CDCl₃)δ: 4.83(s,2 H), 7.44 (d,J=8 Hz, 1 H), 7.6-8.0 (m,5 H), 8.49(d,J=2 Hz, 1 H)

(2) The reaction procedure of Reference Example 3 was repeated exceptthat N-(6-bromo-3-pyridylmethyl)phthalimide was used in lieu ofN-(6-chloro-3-pyridylmethyl)phthalimide, to give the title compound assale yellow crystals.

m.p.: 57-58° C.

NMR (CDCl₃)δ: 1.46 (br s,2 H), 3.86 (s,2 H), 7.42 (d, J=8 Hz, 1 H), 7.58(dd, J=8 & 2 Hz, 1 H), 8.32 (d,J=2 Hz, 1 H)

REFERENCE EXAMPLE 44N-(6-Chloro-3-pyridylmethyl)-N-(2,2,2-trifluoroethyl)amine

In 15 ml of water was dissolved 12.55 g of 2,2,2-trifluoroethylaminehydrochloride, followed by addition of 68 ml of CH₃ CN, and further 9.35g of Et₃ N and then 3.00 g (0.0185 mole) of 6-chloro-3-pyridylmethylchloride under cooling with ice-water and stirring. The mixture wasstirred at room temperature for one hour, at 50° C. for one hour and at70° C. for 90 hours. The CH₃ CN was distilled off, and the residue wasfollowed by addition of NaHCO₃ and then extracted with CH₂ Cl₂ (100ml×3). The extract was dried over MgSO₄ and distilled to remove CH₂ Cl₂.To the residue was added 100 ml of Et₂ O and the resulting unsolublematter was filtered off. The filtrate was concentrated to give 3.85 g ofthe title compound as yellow oil.

NMR (CDCl₃)δ: 1.81 (br, NH), 3.21 (q,J=9 Hz, CF₃ CH₂), 3.92(s,pyridine-CH₂), 7.30 (d,J=8 Hz, 1 H), 7.71 (dd, J=8 & 2 Hz, 1 H), 8.32(d,J=2 Hz, 1 H)

Example 1

1-Methylthio-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 1-1) and1,1-bis(3-pyridylmethyl)-amino-2-nitroethylene (Compound 1-2)

In 100 ml of EtOH was dissolved 5.0 g (0.03 mole) of1,1-bis(methylthio)-2-nitroethylene with heating and, then, a solutionof 3.2 g (0.03 mole) of 3-pyridylmethylamine in 30 ml of EtOH was addeddropwise in 3 installments at intervals of 20-30 minutes whilerefluxing. The mixture was further refluxed for 2 hours and the EtOH wasdistilled off. The residue was subjected to silica gel columnchromatography using CHCl₃ -MeOH (5:1) as an eluent. The procedure gave4.0 g and 0.5 g of the title Compounds (1-1 and 1-2), respectively, eachas a white powder.

Compound 1-1

m.p.: 129-130° C.

Compound 1-2

m.p.: 141-143° C.

NMR (DMSO-d₆) δ: 4.55 (d), 6.52 (s), 10.26 (br s) IR (Nujol) :3150,1575, 1390 cm⁻¹

Example 2

1-Methylthio-1-(N-methyl-N-3-pyridylmethyl)amino-2-nitroethylene(Compound 2)

The procedure of Example 1 was repeated except thatN-methyl-N-pyridylmethylamine was used in lieu of 3-pyridylmethylamineto give the title compound as a pale yellow viscous oil.

NMR (CDCl₃) δ: 2.50 (s), 3.06 (s), 4.81 (s), 6.81 (s)

Example 3 1-Methylamino-1-(3-pyridylmethyl)amino-2-nitroethylene(Compound 3)

In 50 ml of EtOH was dissolved 2.3 g (0.01 mole) of1-methylthio-1-(3-pyridylmethyl)amino-2-nitroethylene with heating and,then, a solution of 1:2 g (0.015 mole) of 40% aqueous methylamine in 10ml of EtOH was added dropwise over a period of 30 minutes whilerefluxing. The mixture was further refluxed for 2 hours, after which itwas concentrated. The crystals were collected by filtration andrecrystallized from acetonitrile to give 1.6 g of the title compound aswhite prisms.

m.p.: 159-160° C.

NMR (DMSO-d₆) δ: 2.86 (br s), 4.49 (d), 6.46 (s)

Example 4

1-Methylthio-1-(3-pyridylmethyl)amino-2-nitroethylene was reacted withvarious amines (or ammonium) in the same manner as Example 3 and thereaction product was purified by recrystallization or silica gel columnchromatography to give the following compounds 4-22.

(1) 1-Ethylamino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 4)

m.p.: 161-162° C.

(2) 1-iso-propylamino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound5)

m.p.: 148-150° C.

NMR (CDCl₃) δ: 4.46 (d), 6.52 (s), 7.28 (br s), 10.1 (br s)

(3) 1-n-Butylamino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 6)

m.p.: 110-112° C.

(4) 1-Allylamino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 7)

m.p.: 114-115° C.

(5) 1-n-Pentylamino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound8)

m.p.: 97-98° C.

(6) 1-Anilino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 9)

m.p.: 217-218° C.

(7) 1-Amino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 10)

m.p.: 177-178° C. (decompn.)

(8)1-(2-n-Propylthioethyl)amino-1-(3-pyridylmethyl)-amino-2-nitroethylene(Compound 11) (white prisms)

m.p.: 93-94° C.

NMR (CDCl₃) δ: 4.48 (d), 6.23 (br s), 6.63 (s), 10.5 (br s)

(9)1-(2-Dimethylaminoethyl)amino-1-(3-pyridylmethyl)-amino-2-nitroethylene(Compound 12) (white prisms)

m.p.: 110-111° C.

NMR (CDCl₃) δ: 2.02 (s), 4.30 (m), 6.60 (s), 10.3 (br s)

(10) 1-(2-Hydroxyethyl)amino-1-(3-pyridylmethyl)amino-2-nitroethylene(Compound 13)

m.p. 161-163° C.

(11) 1-(2-Methoxyethyl)amino-1-(3-pyridylmetyl)amiino-2-nitroethylene(Compound 14)

m.p.: 108-109° C.

(12)1-(2,2-Dimethoxyethyl)amino-1-(3-pyridylmethyl)-amino-2-nitroethylene(Compound 15) (white prisms)

m.p.: 96-98° C.

NMR (CDCl₃) δ: 6.55 (s), 6.85 (br s), 10.3 (br s)

(13)1-(3-Pyridylmethyl)amino-1-(2,2,2-trifluoroethyl)-amino-2-nitroethylene(Compound 16)

m.p.: 164-165° C.

NMR (DMSO-d₆) δ: 4.09 (m), 6.58 (s)

(14)1-(3-Pyridylmethyl)amino-1-(trimethylsilylmethyl)-amino-2-nitroethylene(Compound 17)

m.p.: 156-157° C.

NMR (CDCl₃) δ: 0.10 (s), 2.67 (d), 4.32 (d), 6.37 (s), 7.12 (br s), 10.1(br s)

(15) 1-Hydrazino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound 18)

m.p.: 176-177° C. (decompn.)

(16) 1-Dimethylamino-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound19)

m.p.: 68-70° C.

NMR (CDCl₃) δ: 2.93 (s), 4.48 (d), 6.52 (s), 9.77 (br s)

(17) 1-(3-Pyridylmethyl)amino-1-pyrrolidino-2-nitroethylene (Compound20) (pale yellow powder)

m.p.: 103-105° C.

NMR (CDCl₃) δ: 4.61 (d), 6.63 (s), 10.42 (br s)

(18) 1-(4-Methylpiperazino)-1-(3-pyridylmethyl)amino-2-nitroethylene(Compound 21)

NMR (CDCl₃) δ: 2.32 (s), 2.46 (t), 3.25 (t), 4.53 (d), 6.50 (s), 9.73(br s)

(19) 1-(Morpholino)-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound22)

m.p.: 102-103° C.

Example 5 1-Piperidino-1-(3-pyridylmethyl)amino-2-nitroethylene(Compound 23)

In 20 ml of EtOH was dissolved 0.8 g (0.004 mole) of1-methylthio-1-piperidino-2-nitroethylene followed by addition of 0.4 g(0.004 mole) of 3-pyridiylmethylamine. The mixture was refluxed for 2hours. The ethanol was distilled off and the residue was purified bysilica gel column chromatography to give 0.3 g of the title compound asa pale yellow powder.

m.p.: 106-108° C.

Example 61-(2,2-Dimethyl-1-hydrazino)-1-(3-pyridylmethyl)-amino-2-nitroethylene(Compound 24)

The procedure of Example 5 was repeated using1-(2,2-dimethyl-1-hydrazino)-1-methylthio-2-nitroethylene to give thetitle compound as white prisms.

m.p.: 158-159° C.

NMR (CDCl₃) δ: 2.63 (s), 4.36 (d), 6.45 (s), 6.85 (br s), 10.36 (br s)

Example 7 1-Amino-1-(N-methyl-N-3-pyridylmethyl)amino-2-nitroethylene(Compound 25)

In 50 ml of MeOH was dissolved 7.2 g (0.03 mole) of1-methylthio-1-(N-methyl-N-3-pyridylmethyl)amino-2-nitroethylenefollowed by addition of 10 ml of 25% agueous ammonia. The mixture wasresfluxed for 2 hours, ater which the solvent was distilled off. Theresisdue was subjected to silica gel column chromatography using CHCl₃--MeOH (5:1) as an eluent to give 1.5 g of the title compound as whiteprisms.

m.p.: 158-159° C.

NMR (DMSO-d₆) δ: 3.06 (s), 4.66 (s), 6.63 (s), 8.93 (br s)

Example 81-Methylamino-1-(N-methyl-N-3-pyridylmethyl)amino-2-nitroethylene(Compound 26)

(1) In 30 ml of toluene was dissolved 2.5 g (0.02 mole) ofN-methyl-N-3-pyridylmethylamine followed by addition of 1.5 g (0.02mole) of methyl isothiocyanate and the mixture was stirred at roomtemperature overnight. Finally, the solvent was distilled off to give3.8 g of N-methyl-N'-methyl -N'-3-pyridylmethylthiourea as a yellowviscous oil. This oily product was purified by silica gel columnchromatography using HeOH--CHCl₃ (1:10) as an eluent to give crystals.

m.p. : 86-87° C.

NMR (CDCl₃) δ: 3.06 (s), 3.17 (d), 5.22 (s), 6.16 (br s), 7.28 (dd. J=8& 5 Hz, 1 H), 7.74 (m. 1 H), 8.54 (m. 2 H)

(2) In 30 ml of MeOH was dissolved 3.8 g (0.02 mole) of theN-methyl-N'-methyl-N'-3-pyridylmethylthiourea obtained in (1) followedby addition of 2.8 g (0.02 mole) of methyl iodide. The mixture wasrefluxed for 4 hours. The solvent was distilled off and the residue wasdiluted with 10 ml or a saturated aqueous solution of sodium hydrogencarbonate and extracted with AcOEt (50 ml×3). The extract was dried overMgSO₄ and the solvent was distilled off to give 1.0 g of crudeS-methyl-N-methyl-N'-methyl-N'-(3-pyridylmethyl)isothiourea as a yellowoil.

NMR (CDCl₃) δ: 2.33 (s), 2.83 (s), 3.26 (s), 4.56 (s), 7.25(dd, J=8 & 5Hz, 1 H), 7.60 (m, 1 H), 8.55 (m, 2 H)

(3) To 1.0 g (0.048 mole) of theS-methyl-N-methyl-N'-methyl-N'-(3-pyridylmethyl)isothiourea obtained in(2) was added 5 ml of nitromethane and the mixture was stirred at 90° C.for 15 hours. The nitromethane was distilled off and the residue wassubjected to silica gel column chromatography using CHCl₃ -MeOH (5:1) asan eluent to give 0.3 g of the title compound as a yellow viscous oil.This product was cooled (to 5° C.) and the resulting crystals werewashed with ethyl acetate and dried. The melting point of this productwas 86-87° C.

NMR (CDCl₃) δ: 2.83 (s), 3.07 (d), 4.43 (s), 6.53 (s), 7.35 (dd, J-8 & 5Hz, 1 H), 7.61 (m, 1 H), 8.60 (m, 1 H), 9.73 (br s)

Example 9 1-(6-Chloro-3-pyridylmethyl)amino-1-methylthio-2-nitroethylene(Compound 27)

To 100 ml of EtOH were added 2.4 g (1.5×10⁻² mole) of1,1-bis(methylthio)-2-nitroethylene and 1.4 g (9.8×10⁻³ mole) of6-chloro-3-pyridylmethylamine and the mixture was refluxed for 2 hours.The EtOH was distilled off and the residue was subjected to silica gelcolumn chromatography using CH₂ Cl₂ as an eluent. The procedure gave 1.2g of the title compound as a pale yellow solid.

NMR (DMSO-d₆) δ: 2.48 (s, 3 H), 4.71 (d, J=6.7 Hz, 2 H), 6.66 (br s, 1H), 7.50 (d, J=8.8 Hz, 1 H), 7.84 (dd, J=8.8 & 2.8 Hz, 1 H), 8.41 (d,J=2.8 Hz, 1 H), 10.0-11.0 (br, 1 H)

Example 101-(6-Chloro-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene(Compound 28)

In 100 ml of EtOH was dissolved 1.2 g (4.6×10⁻³ mole) of1-(6-chloro-3-pyridylmethyl)amino-1-methylthio-2-nitroethylene and onreflux, a solution of 0.84 g of 40% aqueous methylamine in 30 ml EtOHwas added dropwise over 1 hour. After cooling, the reaction mixture wasconcentrated under reduced pressure to about 50 ml and the resultingcrystals were collected by filtration and dried to give 0.6 g of thetitle compound as pale yellow needles.

m.p.: 181-183° C.

NMR (DMSO-d₆) δ: 2.6-3.1 (m, 3 H), 4.47 (d, J=6.3 Hz, 2 H), 6.45 (s, 1H), 7.48 (d, J=8.8 Hz, 1 H), 7.81 (dd, J=8.8 & 2.7 Hz), 8.39 (d, J=2.7Hz, 1 H), 9.5-10.4 (br, 1 H)

Example 111-[N-(6-Chloro-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 29)

(1) Using N-(6-chloro-3-pyridylmethyl)-N-methylamine, the procedure ofExample 8 (1) was repeated to giveN-(6-chloro-3-pyridylmethyl)-N-methyl-N'-methylthiourea as crystals.

m.p.: 109-110° C.

NMR (CDCl₃) δ: 3.06 (s, 3 H), 3.16 (d, J=4.8 Hz, 3 H), 5.22 (s, 2 H),5.8-6.3 (br, 1 H), 7.30 (d, J=8.6 Hz, 1 H), 7.76 (dd, J=8.6 & 2.7 Hz, 1H), 8.30 (d, J=2.7 Hz, 1 H)

(2) Using the N-(6-chloro-3-pyridylmethyl)-N-methyl-N'-methylthioureaotained in (1), the procedure of Example 8 (2) was repeated to giveS-methyl-N-(6-chloro-3-pyridylmethyl)-N-methyl-N'-methylisothiourea asoil.

NMR (CDCl₃) δ: 2.36 (s, 3 H), 2.94 (s, 3 H), 3.27 (s, 3 H), 4.63 (s, 2H), 7.30 (d, J=8.6 Hz, 1 H), 7.62 (dd, J=8.6 & 2.7 Hz, 1 H), 8.31 (d,J=2.7 Hz, 1 H)

(3) Using theS-methyl-N-(6-chloro-3-pyridylmethyl)-N-methyl-N'-methylisothioureaobtained in (2), the procedure of Example 8 (3) was repeated to give thetitle compound as crystals.

m.p.: 103-104° C.

NMR (CDCl₃) δ: 2.80 (s, 3 H), 3.07 (d, J=4.8 Hz, 3 H), 4.38 (s, 2 H),6.51 (s, 1 H), 7.37 (d, J=8.6 Hz, 1 H), 7.58 (dd, J=8.6 & 2.7 Hz, 1 H),8.31 (d, J=2.7 Hz, 1 H), 9.5-9.9 (br, 1 H)

Example 12 1-Methoxy-1-(3-pyridylmethyl)amino-2-nitroethylene (Compound30)

In one liter of MeOH was dissolved 16.5 g (0.1 mole) of1,1-bis(methylthio)-2-nitroethylene with heating and on reflux, asolution of 11.0 g (0.1 mole) of 3-pyridylmethylamine in 200 ml of MeOHwas added dropwise in 4 installments at 1-hour intervals. The mixturewas further refluxed for 3 hours and the MeOH was distilled off. Theresidue was purified by silica gel column chromatography to give thetitle compound as white prisms. In this procedure, the compound 1-1described in Example 1 was also produced as a byproduct.

m.p.: 129-130° C.

NMR (CDCl₃) δ: 3.86 (s, OMe), 4.60 (d, CH₂ N), 6.68 (s, ═CHNO₂), 10.15(sbr, NH)

Example 131-[N-Ethyl-N-(3-pyridylmethyl)]amino-1-methylamino-2-nitroethylene(Compound 31)

(1) In 50 ml of ethyl ether was dissolved 2.4 g ofN-ethyl-N-(3-pyridylmethyl)amine followed by addition of 1.3 g of methylisothiocyanate. The mixture was stirred at room temperature (25° C.) for1 hour. The resulting precipitate was collected by filtration, washedwith a small amount of ethyl ether and dried to give 3.7 g ofN-methyl-N'-ethyl-N'-(3-pyridylmethyl)thiourea as white prisms.

m.p.: 122-123° C. ##STR32##

(2) In 30 ml of dry tetrahydrofuran was dissolved 3.1 g of theN-methyl-N'-ethyl-N'-(3-pyridylmethyl)thiourea obtained in (1) followedby addition of 0.6 g of 60% sodium hydride. The mixture was stirred atroom temperature (25° C.) for 1 hour. Then, 2.1 g of methyl iodide wasadded dropwise and the mixture was further stirred for 3 hours. Thereaction mixture was concentrated and the residue was diluted with 50 mlof a saturated solution of sodium chloride and extracted 3 times with 50ml portions of ethyl acetate. The extracts were pooled and dried overMgSO₄. The solvent was then distilled off to give 3.1 g of crudeS-methyl-N-methyl-N'-ethyl-N'-(3-pyridylmethyl)isothiourea as a yellowoil. ##STR33##

(3) To 2.2 g of theS-methyl-N-methyl-N'-ethyl-N'-(3-pyridylmethyl)isothiourea obtained in(2) was added 10 ml of nitromethane and the mixture was refluxed for 16hours. The reaction mixture was concentrated and the residue wassubjected to silica gel column chromatography using methanol-chloroform(1:5) as an eluent to give 1.4 g of the title compound as a yellowviscous oil. ##STR34##

Example 141-[N-(2-Dimethoxyethyl)-N-(3-pyridylmethyl)amino-1-methylamino-2-nitroethylene(Compound 32)

Using N-(2-dimethoxyethyl)-N-(3-pyridylmethyl)amine in lieu ofN-ethyl-N-(3-pyridylmethyl)amine, the steps (1), (2) and (3) of Example13 were carried out to give the following compounds at the respectivesteps.

(1) N-Methyl-N'-(2-dimethoxyethyl)-N'-(3-pyridymethyl)-thiourea (paleyellow viscous oil) ##STR35##

(2)S-Methyl-N-methyl-N'-(2-dimethoxyethyl)-N'-(3-pyridylmethyl)isothiourea(yellow oil) ##STR36##

(3) Title compound (yellow viscous oil) ##STR37##

Example 151-Ethylamino-1-[N-methyl-N-(3-pyridylmethy)]amino-2-nitroethylene(compound 33)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-pyridylmethyl)amine and ethyl isothiocyanate were used inlieu of N-ethyl-N-(3-pyridylmethyl)amine and methyl isothiocynate,respectively; to give the following compounds in the respective steps.

(1) N-ethyl-N'-methyl-N'-(3-pyridylmethyl)thiourea

m.p.: 110-111° C.

NMR (CDCl₃) δ: 1.23 (3 H, t, J=7.5 Hz), 3.05 (3 H, s), 3.5-3.9 (2 H, m),5.20 (2 H, s), 5.8-6.2 (1 H, br), 7.26 (1 H, dd, J=8.4 & 5.4 Hz), 7.72(1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.6 (2 H, m) IR (Nujol): 3180 cm⁻¹

(2) S-Methyl-N-ethyl-N'-methyl-N'-(3-pyridylmethyl)isothiourea (yellowoil)

NMR (CDCl₃) δ: 1.16 (3 H, t, J=7.5 Hz), 2.36 (3 H, s), 2.93 (3 H, s),3.56 (2 H, q, J=7.5 Hz), 4.64 (2 H, s), 7.26 (1 H, dd, J=8.4 & 5.4 Hz),7.63 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.6 (2 H, m)

(3) Title compound (viscous oil)

NMR (CDCl₃) δ: 1.34 (3 H, t, J=7.5 Hz), 2.82 (3 H, s), 3.1-3.6 (2 H, m),4.43 (2 H, s), 6.52 (1 H, s), 7.32 (1 H, dd, J=8.4 & 5.4 Hz), 7.58 (1 H,dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m), 9.3-9.8 (1 H, br) IR (neat): 3220cm⁻¹

Example 161-n-Butylamino-1-[N-methyl-N-(3-pyridylmethyl)]-amino-2-nitroethylene(Compound 34)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-pyridylmethyl)amine and n-butyl isothiocyanate were usedin lieu of N-ethyl-N-(3-pyridylmethyl)amine and methyl isothiocyanate,respectively, to give the following compounds in the respective steps.

(1) N-n-Butyl-N'-methyl-N'-(3-pyridylmethyl)thiourea (pale yellow oil)

NMR (CDCl₃) δ: 0.93 (3 H, t, J=7.8 Hz), 1.2-1.9 (4 H, m), 3.06 (3 H, s),3.4-3.9 (2 H, m), 5.21 (2 H, s), 5.5-6.1 (1 H, br), 7.28 (1 H, dd, J=8.4& 5.4 Hz), 7.74 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m) IR (neat):3270 cm⁻¹

(2) S-Methyl-N-n-butyl-N'-methyl-N'-(3-pyridylmethyl)-isothiourea(yellow oil)

NMR (CDCl₃) δ: 0.90 (3 H, t, J=7.8 Hz), 1.1-1.9 (4 H, m), 2.30 (3 H, s),2.85 (3 H, s), 3.49 (2 H, t, J=6.8 Hz), 4.56 (2 H, s), 7.23 (1 H, dd,J=8.4 & 5.4 Hz), 7.60 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.6 (2 H, m)

(3) Title compound (viscous oil)

NMR (CDCl₃) δ: 0.94 (3 H, t, J=7.8 Hz), 1.2-1.9 (4 H, m), 2.80 (3 H, s),3.34 (2 H, m), 4.42 (2 H, s), 6.54 (1 H, s), 7.34 (1 H, dd, J=8.4 & 5.4Hz), 7.58 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m), 9.4-9.9 (1 H, br)IR (neat): 3210 cm⁻¹

Example 171-Methylamino-1-[N-(2-methoxyethyl)-N-(3-pyridyl-methyl)]amino-2-nitroethylene(Compound 35)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(2-methoxyethyl)-N-(3-pyridyl-methyl)amine was used in lieu ofN-ethyl-N-(3-pyridyl-methyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-(2-methoxyethyl)-N'-(3-pyridylmethyl)-thiourea(colorless viscous oil) ##STR38##

(2)S-Methyl-N-methyl-N'-(2-methoxyethyl)-N'-(3-pyridyl-methyl)isothiourea(oil) ##STR39##

(3) Title compound (yellow viscous oil) ##STR40##

Example 18

1-Allylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene(Compound 36)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-pyridylmethyl)amine and allyl isothiocyanate were used inlieu of N-ethyl-N-(3-pyridylmethyl)amine and methyl isothiocyanate,respectively, to give the following compounds in the respective steps.

(1) N-Allyl-N'-methyl-N'-(3-pyridylmethyl)thiourea

m.p.: 82-84° C.

NMR (CDCl₃) δ: 3.07 (3 H, s), 4.34 (2 H, m), 5.0-5.4 (2 H, m), 5.21 (2H, s), 5.6-6.3 (2 H, m), 7.27 (1 H, dd, J=8.4 & 5.4 Hz), 7.73 (1 H, dt,J=8.4 & 1.5 Hz), 8.4-8.6 (2 H, m) IR (Nujol): 3280 cm⁻¹

(2) S-Methyl-N-allyl-N'-methyl-N'-(3-pyridylmethyl)isothiourea (yellowoil)

NMR (CDCl₃) δ: 2.30 (3 H, s), 2.90 (3 H, s), 4.1-4.3 (2 H, m), 4.62 (2H, s), 4.9-5.3 (2 H, m), 5.7-6.3 (1 H, m), 7.26 (1 H, dd, J=8.4 & 5.4Hz), 7.62 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m)

(3) Title compound (oil)

NMR (CDCl₃) δ: 2.81 (3 H, s), 3.9-4.2 (2 H, m), 4.43 (2 H, s), 5.1-5.6(2 H, m), 5.7-6.2 (1 H, m), 6.55 (1 H, s), 7.35 (1 H, dd, J=8.4 & 5.1Hz), 7.60 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m), 9.4-9.9 (1 H, br)

Example 191-iso-Propylamino-1-(N-methyl-N-(3-pyridylmethyl)]-amino-2-nitroethylene(Compound 37)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-pyridylmethyl)amine and iso-propyl isothiocyanate wereused in lieu of N-ethyl-N-(3-pyridylmethyl)amine and methylisothiocyanate, respectively, to give the following compounds in therespective steps.

(1) N-iso-Propyl-N'-methyl-N'-(3-pyridylmethyl)thiourea

m.p.: 135-136° C.

NMR (CDCl₃) δ: 1.26 (6 H, d, J=6.3 Hz), 3.03 (3 H, s), 4.4-4.9 (1 H, m),5.21 (2 H, s), 5.0-5.5 (1 H, br), 7.27 (1 H, dd, J=8.4 & 5.1 Hz), 7.74(1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m) IR (Nujol): 3200 cm⁻¹

(2) S-Methyl-N-iso-propyl-N'-methyl-N'-(3-pyridylmethyl)-isothiourea(oil)

NMR (CDCl₃) δ: 1.07 (6 H, d, J=6.3 Hz), 2.30 (3 H, s), 2.84 (3 H, s),3.6-4.1 (1 H, m), 4.50 (2 H, s), 7.23 (1 H, dd, J=8.4 & 5.1 Hz), 7.61 (1H, dt, J=8.4 & 1.5 Hz), 8.4-8.6 (2 H, m)

(3) Title compound

m.p.: 119-121° C.

NMR (CDCl₃) δ: 1.31 (6 H, d, J=6.6 Hz), 2.83 (3 H, s), 3.5-4.0 (1 H, m),4.44 (2 H, s), 6.52 (1 H, s), 7.33 (1 H, dd, J=8.4 & 5.1 Hz), 7.57 (1 H,dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m), 8.9-9.4 (1 H, br d, J=9.6 Hz) IR(Nujol): 3080 cm⁻¹

Example 20

1-Benzylamino-1-[N-methyl-N-(3-pyridylimethyl)]amino-2-nitroethylene(Compound 38)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-pyridylmethyl)amine and benzyl isothiocyanate were used inlieu of N-ethyl-N-(3-pyridylmethyl)amine and methyl isothiocyanate,respectively, to give the following compounds in the respective steps.

(1) N-Benzyl-N'-methyl-N'-(3-pyridylmethyl)thiourea (pale yellow oil)

NMR (CDCl₃) δ: 3.03 (3 H, s), 4.90 (2 H, d, J=5.1 Hz), 5.21 (2 H, s),6.10 (1 H, br), 7.1-7.5 (6 H, m), 7.74 (1 H, dt, J=8.4 & 1.5 Hz),8.4-8.6 (2 H, m) IR (neat): 3250 cm⁻¹

(2) S-Methyl-N-benzyl-N'-methyl-N'-(3-pyridylmethyl)isothiourea (oil)

NMR (CDCl₃) δ: 2.29 (3 H, s), 2.92 (3 H, s), 4.62 (2 H, s), 4.77 (2 H,s), 7.1-7.5 (6 H, m), 7.59 (1 H, dt, J=8.4 & 1.5 Hz), 8.4-8.7 (2 H, m)

(3) Title compound (oil)

NMR (CDCl₃) δ: 2.78 (3 H, s), 4.36 (2 H, s), 4.53 (2 H, d, J=6.0 Hz),6.56 (1 H, s), 7.1-7.5 (7 H, m), 8.3=8.5 (1 H, m), 8.57 (1 H, dd, J=5.2& 1.5 Hz), 9.7-10.2 (1 H, br)

Example 21 1-Methylamino-1-[N-methyl-N-(3-quinolylmethyl)]-amino-2-nitroethylene (Compound 39)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-quinolylmethyl)amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-(3-quinolylmethyl)thiourea

m.p.: 138-139° C.

NMR (CDCl₃) δ: 3.09 (s, MeNCH₂), 3.18 (d, J=5 Hz, MeNH), 5.35 (s, NCH₂),6.00 (br, NH), 7.4-7.9 (m, 3 H, quinoline-H₃), 8.0-8.2 (m, 2 H,quinoline-H₂), 8.33 (d, J=2 Hz, 1 H, quinoline-H₁) IR (Nujol): 3200,1545, 1530, 1495, 1445, 1375, 1335, 1240, 1050 cm⁻¹

(2) S-Metyl-N-metyl-N'-methyl-N'-(3-quinolylethyl)isothiourea (oil)

NMR (CDCl₃) δ: 2.33 (s, MeS), 2.89 (s, MeNCH₂), 3.28 (s, MeN═), 4.73 (s,NCH₂), 7.2-7.9 (m, 3 H, quinoline-H₃) 7.9-8.2 (m, 2 H, quinoline-H₂),8.85 (d, J=2 Hz, 1 H, quinoline-H₁) IR (neat): 1600, 1490, 1370, 1340,1060, 1020, 755 cm⁻¹

(3) Title compound

m.p.: 145-157° C.

NMR (CDCl₃) δ: 2.85 (s, MeNCH₂), 3.08 (d, J=6 Hz, MeNH), 4.58 (s, NCH₂),6.59 (s, ═CHNO₂), 7.5-7.95 (m, 3 H, quinoline-H₃), 7.95-8.25 1010 (m, 2H, quinoline-H₂), 8.81 (d, J=2 Hz, 1 H, quinoline-H₁), 9.80 (br, NH) IR(Nujol): 1590, 1545, 1405, 1310, 1280, 1230 cm⁻¹

Example 221-Metylamino-1-[N-methyl-N-[1-(3-pyridyl)ethyl]]-amino-2-nitroethylene(Compound 40)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-[1-(3-pyridyl)ethyl]amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-[1-(3-pyridyl)ethyl]thiourea (pale yellowviscous oil)

NMR CDCl₃) δ: 1.56 (d, J=7 Hz, MeCH), 2.76 (s, MeNCH₂), 3.18 (d, J=5 Hz,MeNH), 6.30 (br, NH), 7.04 (q, J=7 Hz, MeCH), 7.28 (dd, J=7 and 5 Hz, 1H, pyridine-H₁), 7.70 (m, 1 H pyridine-H₁), 8.5 (m, 2 H, pyridine-H₂) IR(neat): 3270, 1550 (sh.), 1530, 1480, 1420, 1375, 1340, 1295 cm⁻¹

(2) S-Methyl-N-methyl-N'-methyl-N'-[1-(3-pyridyl)-ethyl]thiourea (oil)

NMR (CDCL₃) δ: 1.54 (d, J=7 Hz, MeCH), 2.31 (s, MeS), 2.63 (s, MeNCH₂),3.27 (s, MeN═), 5.66 (q, J=7 Hz, MeCH), 7.24 (dd, J=5 & 8 Hz, 1 H,pyridine-H₁), 7.62 (m, 1 H, pyridine-H₁), 8.48 (dd, J=5 & 2 Hz, 1 H,pyridine-H₁), 8.59 (d, J=2 Hz, 1 H, pyridine-H₁) IR (neat): 2910, 1600,1415, 1390, 1370, 1235, 1070, 1010, 71.0 cm⁻¹

(3) Title compound (viscous oil)

NMR (CDCl₃) δ: 1.70 (d, J=7 Hz, MeCH), 2.63 (s, MeN), 3.02 (d, j=5 Hz,MeNH), 4.93 (q, J=7 Hz, MeCH), 6.50 (s, ═CHNO₂), 7.33 (dd, J=5 & 8 Hz, 1H, pyridine-H₁), 7.60 (m, 1 H, pyridine-H₁), 8.6 (m, 2 H, pyridine-H₂),9.77 (br, NH) IR (neat): 1585, 1420, 1400, 1340, 1240, 1020, 750 cm⁻¹

Example 231-[2,2-Dimethyl-1-(3-pyridylmethyl)]hydrazino-1-methylamino-2-nitroethylene(Compound 41)

(1) In 30 ml of toluene was dissolved 2.5 g of1,1-dimethyl-2-(3-pyridylmethyl)hydrazine followed by addition of 1.2 gof methyl isothiocyanate and the mixture was refluxed for 1 hour. Thereaction mixture was concentrated and the resulting crystals arecollected by filtration, washed with ethyl ether and dried. Theprocedure gave 2.6 g of1,1-dimethyl-4-methyl-2-(3-pyridylmethyl)thiosemicarbazide as whiteprisms.

m.p.: 101-102° C.

NMR (CDCl₃) δ: 2.45 (s, Me₂ N), 3.17 (d, J=5 Hz, MeNH), 5.28 (s, CH₂ N),7.20 (dd, J=8 and 5 Hz, 1 H, pyridine-H₁), 7.89 (m, 1 H, pyridine-H₁),8.10 (br, NH), 8.50 (dd, J=5 & 2 Hz, 1 H, pyridine-H₁), 8.62 (d, J=2 Hz,1 H, pyridine-H₁) IR (Nujol): 3200, 1514, 1420, 1370, 1320, 975 cm⁻¹

(2) 0.52 g of 60% sodium hydride was washed with petroleum ether andsuspended in 20 ml of dry tetrahydrofuran, followed by addition of 2.9 gof 1,1-dimethyl-4-methyl-2-(3-pyridylmethyl)thiosemicarbazide asprepared according to (1). The mixture was stirred at 50° C. for 2hours. After cooling and addition of 1.8 g of methyl iodide, the mixturewas stirred at room temperature (25° C.) for 2 hours and, then,concentrated. To the residue was added 50 ml of ethyl acetate and theinsoluble matter was filtered off. The filtrate was dried over MgSO₄ andconcentrated to give 2.2 g ofS-methyl-1,1-dimethyl-4-methyl-2-(pyridylmethyl)isothiosemicarbazide asoil.

NMR (CDCl₃) δ: 2.41 (s, MeS), 2.60 (s, Me₂ N), 3.06 (s, MeN), 4.30 (s,CH₂ N), 7.18 (dd, J=5 & 8 Hz, 1 H, pyridine-H₁), 7.60 (m, 1 H,pyridine-H₁), 8.10 (dd, J=5 & 2 Hz, 1 H, pyridine-H₁), 8.21 (d, J=2 Hz,pyridine-H₁) IR (neat): 1600, 1420, 1240, 1020, 710 cm⁻¹

(3) To 2.2 g ofS-methyl-1,1-dimethyl-4-methyl-2-(pyridylmethyl)isothiosemicarbazideprepared in (2) was added 10 ml of nitromethane and the mixture wasrefluxed for 7 hours. The reaction mixture was concentrated andsubjected to silica gel column chromatography using chloroform-methanol(5:1) as an eluent. The procedure gave 1.0 g of the title compound asyellow prisms.

m.p.: 109-110° C.

NMR (CDCl₃) δ: 2.62 (s, Me₂ N), 3.16 (d, J=6 Hz, MeN), 4.43 (s, CH₂ N),6.43 (s, ═CHNO₂), 7.27 (dd, J=8 & 5 Hz, 1 H, pyridine-H₁), 7.60 (m, 1 H,pyridine-H), 8.5-8.65 (m, 2 H, pyridine-H₂), 10.1 (br, NH) IR (Nujol):1585, 1405, 1340, 1315, 1235 cm⁻¹

Example 241-Methylamino-1-[N-(n-propyl)-N-(3-pyridyl-methyl)]amino-2-nitroethylene(Compound 42)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-n-propyl-N-(3-pyridylmethyl)amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective stems.

(1) N-Methyl-N'-(n-propyl)-N'-(3-pyridylmethyl)thiourea (pale yellowviscous oil)

NMR (CDCl₃) δ: 0.90 (t), 1.4-1.9 (m), 3.16 (d, MeN), 3.42 (t), 5.15 (s),5.87 (br s, NH), 7.26 (dd), 7.74 (dt), 8.46-8.60 (m, 2 H) IR (neat):3270, 1525, 1340, 1235, 1020, 710 cm⁻¹

(2) S-Methyl-N-methyl-N'-(n-propyl)-N'-(3-pyridyl-methyl)isothiourea(yellow oil)

NMR (CDCl₃) δ: 0.84 (t), 1.33-1.80 (m), 2.29 (s, MeS), 3.23 (s, MeN),3.26 (t), 4.55 (s), 7.22 (dd), 7.56 (dt), 8.43-8.60 (m, 2 H) IR (neat):1600, 1425, 1210, 715 cm⁻¹

(3) Title compound (yellow viscous oil)

NMR (CDCl₃) δ: 0.86 (t), 1.40-1.90 (m, 2 H), 2.95-3.30 (m, 2 H), 3.05(d, MeN), 4.53 (s, 2 H), 6.55 (s, ═CHNO₂), 7.34 (dd), 7.66 (dt),8.43-8.66 (m, 2 H), 9.56 (br d, NH)

Example 251-[N-(n-Butyl-N-(3-pyridyl)]amino-1-methylamino-2-nitroethylene(Compound 43)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(n-butyl)-N-(3-pyridylmethyl)amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(n-Butyl)-N-(3-pyridylmethyl)-N'-methylthiourea (pale yellowviscous oil)

NMR (CDCl₃) δ: 0.90 (t), 1.1-1.8 (m, 4 H), 3.15 (d, MeN), 3.30-3.56 (m),5.13 (s), 5.82 (br s, NH), 7.25 (dd), 7.73 (dt), 8.43-8.60 (m, 2 H) IR(neat) 3280, 1525, 1345, 1230, 1030, 710 cm⁻¹

(2) S-Methyl-N-methyl-N'-(n-butyl)-N'-(3-pyridylmethyl-isothiourea(yellow oil)

NMR (CDCl₃) δ: 0.86 (t), 1.03-1.70 (m, 4 H), 2.28 (s, MeS), 3.23 (s,MeN), 3.30 (t), 4.54 (s), 7.22 (dd), 7.56 (dt), 8.40-8.56 (m, 2 H) IR(neat): 1605, 1425, 1190, 1020, 715 cm⁻¹

(3) Title compound (viscous oil)

NMR (CDCl₃) δ: 0.90 (t), 1.06-1.80 (m, 4 H), 2.96-3.23 (m, 2 H), 3.07(d, MeN), 4.40 (s), 6.56 (s, ═CHNO₂), 7.33 (dd), 7.60 (dt), 8.46-8.66(m, 2 H), 9.82 (br d, NH)

Example 26

1-[N-Benzyl-N-(3-pyridylmethyl)amino-1-methyl-amino-2-nitroethylene(Compound 44)

The steps (1), (2) and (3) of Example 13 were repeated except thatN-benzyl-N-(3-pyridylmethyl)amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Benzyl-N-(3-pyridylmethyl)-N'-methylthiourea

m.p.: 141-143° C. (white prisms)

(2) S-Methyl-N-methyl-N'-benzyl-N'-(3-pyridylmethyl)-isothiourea (yellowoil)

NMR (CDCl₃) δ: 2.32 (s, MeS), 3.26 (s, MeN), 4.45 (s), 4.52 (s),7.06-7.36 (m, 6 H), 7.50 (dt), 8.36-8.53 (m, 2 H) IR (neat): 1600, 1425,1180, 1020, 700 cm⁻¹

(3) Title compound

m.p.: 118-119° C. (pale yellow scales)

NMR (CDCl₃) δ: 3.16 (d, J=5 Hz, MeN), 4.22 (s, CH₂ and CH₂), 6.53 (s,═CHNO₂), 7.06-7.60 (m, 7 H), 8.40 (br s), 8.60 (br d), 9.76 (br d, J=5Hz, NH) IR (Nujol): 1590, 1520, 1450, 1360, 1280 cm⁻¹

Example 271-Amino-1-[N-(6-chloro-3-pyridylmethyl)-N-methyl]-amino-2-nitroethylene(Compound 45)

(1) In 200 ml of EtOH was dissolved 5.0 g of1,1-bis-(methylthio)-2-nitroethylene with heating and a solutioncontaining 4.7 g of N-(6-chloro-3-pyridylmethyl)-N-methylamine in 50 mlof EtOH was added dropwise on reflux in 3 portions at 30-minuteintervals. After completion of dropwise addition, the mixture wasfurther refluxed for 3 hours and the EtCH was then distilled off. Theresidue was subjected to silica gel column chromatography using CHCl₃--MeOH (20:1) as an eluent. The procedure gave 3.5 g of1-[N-(6-chloro-3-pyridylmethyl)-N-methyl]amino-1-methylthio-2-nitroethyleneas a yellow viscous oil.

NMR (CDCl₃) δ: 2.46 (s, MeS), 3.03 (s, MeN), 4.76 (s, CH₂), 6.76 (s,═CHNO₂), 7.35 (d), 7.60 (dd), 8.30 (d) IR (neat): 1750, 1540, 1260,1100, 1020 cm⁻¹

(2) In 20 ml of MeOH was dissolved 1.1 g of1-[N-(6-chloro-3-pyridylmethyl)-N-methyl]amino-1-methylthio-2-nitroethyleneprepared in (1), followed by addition of 1.0 ml of 25% aqueous ammonia,and the mixture was stirred at room temperature for 1 hour. Theresulting crystals were collected by filtration, washed with a smallamount of MeOH and dried to give 0.85 g of the title compound as paleyellow scales.

m.p.: 206-207° C.

NMR (DMSO-d₆) δ: 3.03 (s, MeN), 4.65 (s, CH₂), 6.60 (s, ═CHNO₂), 7.45(d), 7.68 (dd), 8.31 (d), 8.92 (br s, NH₂) IR (Nujol): 3280, 3140, 1625,1580, 1420, 1225 cm⁻¹

Example 281-(6-Chloro-3-pyridylmethyl)amino-1-dimethylamino-2-nitroethylene(Compound 46)

(1) In 50 ml of EtOH was dissolved 3.3 g of1,1-bis-(methylthio)-2-nitroethylene and 2.2 ml of a 40% aqueoussolution of dimethylamine was added dropwise in 2 portions at 30-minuteintervals under refluxing. After completion of dropwise addition, themixture was further refluxed for 30 minutes. Then, the EtOH wasdistilled off and the residue was subjected to silica gel columnchromatography using CHCl₃ -MeOH (20:1) as an eluent. The procedure gave1.0 g of 1-dimethylamino-1-methylthio-2-nitroethylene as a yellow oil.

NMR (CDCl₃) δ: 2.46 (s, 3 H), 3.21 (s, 6 H), 6.69 (s, 1 H)

(2) The 1-dimethylamino-1-methylthio-2-nitroethylene (1.0 g) prepared in(1) and 1.0 g of 6-chloro-3-pyridylmethylamine were refluxed in 30 ml ofEtOH for 2 hours. The EtOH was then distilled off and the residue wassubjected to silica gel column chromatography using CHCl₃ --MeOH (10:1)as an eluent. The crystals obtained were recrystallized from EtOH torecover 0.82 g of the title compound as pale yellow crystals.

m.p.: 124-125° C.

NMR (CDCl₃) δ: 2.99 (s, 6 H), 4.53 (d, J=5.4 Hz, 2 H), 6.46 (s, 1 H),7.34 (d, J=8.4 Hz, 1 H), 7.72 (dd, J=8.4 & 2.4 Hz, 1 H), 8.35 (d, J=2.4Hz, 1 H), 9.2-9.8 (br, 1 H) IR (Nujol): 1585, 1440, 1380, 1260 cm⁻¹

Example 29

1-(2,6-Dichloro-3-pyridylmethyl) amino-1-methylamino-2-nitroethylene(Compound 47) ##STR41##

A mixture of 1.2 g (0.007 mole) of (2,6-dichloro-3-pyridylmethyl)amineand 1 sg (0.007 mole) of 1-methyl-amino-1-methylthio-2-nitroethane wasrefluxed in 50 ml of EtOH for 6 hours. After cooling, the reactionmixture was concentrated and the resulting crystals were collected byfiltration, washed with CH₂ Cl₂ and a small amount of EtOH in that orderand dried. The procedure gave 0.53 g of the title compound as a whitepowder.

m.p.: 211-213° C. (decompn.)

NMR (DMSO-d₆) δ: 2.83 (br, 3 H), 4.50 (br d, 2 H), 6.43 (s, 1 H), 7.58(d, J=8.5 Hz), 7.80 (d, J=8.5 Hz), 7.0-7.93 (br, NH), 9.50-10.50 (br,NH) IR (Nujol): 3170, 1630, 1580, 1375, 1210 cm⁻¹

Example 301-Amino-1-[N-(2,6-dichloro-3-pyridylmethyl)-N-methyl]amino-2-nitroethylene(Compound 48) ##STR42##

In 30 ml of MeOH was dissolved 0.9 g (0.003 g mole) of1-[N-(2,6-dichloro-3-pyridylmethyl)-N-methyl]-amino-1-methylthio-2-nitroethylene,followed by addition of 0.6 ml (0.0045 mole) of 25% aoueous ammonia at50° C., and the mixture was stirred at the same temperature for 1 hour.After cooling, the reaction mixture was concentrated and the resultingcrystals were collected by filtration, washed with a small amount ofEtOH and dried. The procedure gave 0.7 g of the title compound as awhite powder.

m.p.: 214-215° C. (decompn.)

NMR (DMSO-d₆) δ: 3.05 (s, 3 H), 4.63 (s, 2 H), 6.56 (s, 1 H), 7.46-7.70(m, 2 H), 8.90 (br s, NH₂) IR (Nujol): 3350, 1610, 1565, 1410, 1290,1220 cm⁻¹

Example 311-Amino-1-[N-(6-chloro-3-pyridylmethyl)-N-i-propyl]amino-2-nitroethylene(Compound 49) ##STR43##

In 8 ml or EtOH was dissolved 0.59 g (0.00196 mole) of1-[N-(6-chloro-3-pyridylmethyl)-N-i-propyl]-amino-1-methylthio-2-nitroethylene,followed by addition of 0.20 ml of 25% aqueous ammonia. The mixture wasstirred at room temperature for 2 hours and 40 minutes. The reactionmixture was concentrated and the residue was subjected to silica gel(100 g) column chromatography using MeOH--CHCl₃ (1:7) as an eluent togive the title compound as oil. The oil was triturated with Et₂ O andthe resulting powder was collected by filtration, washed with Et₂ O anddried. The procedure gave 0.19 g of the title compound.

NMR (DMSO-d₆) δ: 1.13 (d, J=7 Hz, Me₂ CH), 4.30 (septet, J=7 Hz, Me₂CH), 4.62 (s, CH₂), 6.50 (s, ═CHNO₂), 7.49 (d, J=8 Hz, 1 H), 7.69 (dd,J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H), 9.04 (br, NH₂) IR (Nujol):1610, 1540, 1280, 1230, 1100 cm⁻¹

Example 321-(6-Chloro-3-pyridylmethyl)amino-1-(N-ethyl-N-methyl)amino-2-nitroethylene(Compound 50) ##STR44##

The step (2) of Example 28 was repeated excent that1-(N-ethyl-N-methyl)amino-1-methylthio-2-nitroethylene was used in lieuof 1-dimethylamino-1-methylthio-2-nitroethylene to give the titlecompound as pale yellow crystals.

m.p.: 87-88° C.

NMR (CDCl₃) δ: 1.18 (t, J=6.5 Hz, 3 H), 2.89 (s, 3 H), 3.23 (q, J=6.5Hz, 2 H), 4.46 (d, J=5.7 Hz, 2 H), 6.53 (s, 1 H), 7.34 (d, J=8.4 Hz, 1H), 7.69 (dd, J=8.4 & 2.4 Hz, 1 H), 8.33 (d, J=2.4 Hz, 1 H), 9.5-10.0(br, 1 H) IR (Nujol): 1600, 1460 cm⁻¹

Example 33 1-(6-Chloro-3-pyridylmethyl)amino-1-hydrazino-2-nitroethylene(Compound 51) ##STR45##

The reaction procedure of Example 3 was repeated except that1-(6-chloro-3-pyridylmethyl)amino-1-methylthio-2-nitroethylene andhydrazine hydrate were used in lieu of1-methylthio-1-(3-pyridylmethyl)amino-2-nitroethylene and aqueousmethylamine solution, respectively. The procedure gave the titlecompound as pale yellow crystals.

m.p.: 188-190° C. (decompn.)

NMR (DMSO-d₆) δ: 4.43 (br s, 2 H), 4.3-5.2 (br, 2 H), 6.49 (s, 1 H),7.50 (d, J=8.4 Hz, 1 H), 7.81 (dd, J=8.4 & 2.4 Hz, 1 H), 8.39 (d, J=2.4Hz, 1 H), 9.9-10.8 (br, 1 H) IR (Nujol): 3260, 1650, 1560, 1450 cm⁻¹

Example 34

1-(6-Chloro-3-pyridylmethyl)amino-1-(2,2-dimethyl-1-hydrazino)-2-nitroethylene(Compound 52) ##STR46##

The reaction procedure of Example 6 was repeated except that6-chloro-3-pyridylmethylamine was used in lieu of 3-pyridylmethylamineto give the title compound as pale brown prisms.

m.p.: 170-172° C.

NMR (DMSO-D₆) δ: 2.59 (S, 6 H), 4.43 (d, J=6.6 Hz, 2 H), 6.2-6.7 (br, 1H), 7.47 (d, J=8.4 Hz, 1 H), 7.79 (dd, J=8.4 & 2.4 Hz, 1 H), 8.38 (d,J=2.4 Hz, 1 H), 8.0-8.5 (br, 1 H), 9.9-10.5 (br, 1 H) IR (Nujol): 3200,1590, 1560, 1460, 1390, 1350 cm⁻¹

Example 351-(6-Chloro-3-pyridylmethyl)amino-1-(2-methoxycarbonyl)hydrazino-2-nitroethylene(Compound 53) ##STR47##

To a solution of 0.4 g (0.0016 mole) of1-(6-chloro-3-pyridylmethyl)amino-1-hydrazino-2-nitroethylene in 15 mlof DMF was added 0.14 ml (0.0018 mole) of methyl chloroformate and themixture was stirred at room temperature for 30 minutes. The DMF wasdistilled off under reduced pressure and the residue was subjected tosilica gel column chromatography using EtOH--CHCl₃ (1:7) as an eluent.The procedure gave 0.14 g of the title compound as a pale yellow solid.

m.p.: 198-201° C. (decompn.)

NMR (DMSO-d₆) δ: 3.67 (s, 3 H), 4.48 (br d, J=6 Hz, 2 H), 6.43 (s, 1 H),7.52 (d, J=8.4 Hz, 1 H), 7.80 (dd, J=8.4 & 2.4 Hz, 1 H), 8.38 (d, J=2.4Hz, 1 H), 9.1-9.6 (br, 1 H), 10.0-10.9 (br, 1 H) IR (Nujol): 3110, 1740,1570, 1455 cm⁻¹

Example 361-(6-Chloro-3-pyridylmethyl)amino-1-(2-methyl-aminocarbonyl)hydrazino-2-nitroethylene(Compound 54) ##STR48##

To a solution of 0.3 g (0.0012 mole) of1-(6-chloro-3-pyridylmethyl)amino-1-hydrazino-2-nitroethylene in 5 ml ofDMF was added 0.15 ml (0.0025 mole) of methyl isocyanate and the mixturewas allowed to stand at room temperature for 2 hours. The DMF wasdistilled off under reduced. pressure and the residue was purified bysilica gel column chromatography. The procedure gave 0.08 g of the titlecompound as a white solid.

m.p.: 190-192° C. (decompn.)

NMR (DMSO-d₆) δ: 2.63 (d, J=4.5 Hz, 3 H), 4.49 (br d, J=6.0 Hz, 2 H),6.47 (s, 1 H), 6.5-6.8 (br d, J=4.5 Hz, 1 H), 7.51 (d, J=8.4 Hz, 1 H),7.82 (dd, J=8.4 & 2.4 Hz, 1 H), 8.10 (s, 1 H), 8.40 (d, J=2.4 Hz, 1 H)IR (Nujol): 3200, 1680, 1550, 1455, 1380 cm⁻¹

Example 371-Methylamino-1-[N-methyl-N-[2-(3-pyridyl)ethyl]-amino]-2-nitroethylene(Compound 55) ##STR49##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-[2-(3-pyridyl)ethyl]-amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)-amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-[2-(3-pyridyl)ethyl]thiourea

m.p.: 104-105° C.

NMR (CDCl₃) δ: 3.02 (m, CH₂ -pyridine), 3.04 (s, MeNCH₂), 4.10 (m, CH₂N), 5.90 (br d, J=5 Hz, NH), 7.26 (dd, J=5 & 8 Hz, 1 H), 7.67 (m, 1 H),8.50 (m, 2 H)

(2) S-Methyl-N-methyl-N'-methyl-N'-[2-(3-pyridyl)-ethyl]isothiourea(yellow brown oil)

(Note: After addition of 60% sodium hydride (oil), the mixture wasstirred at 50° C. for 1 hour.)

NMR (CDCl₃) δ: 2.15 (s, MeS), 2.84 (m, CH-pyridine), 2.93 (s, MeNCH₂),3.21 (s, MeN═), 3.61 (m, NCH₂), 7.20 (dd, J=5 & 8 Hz, 1 H), 7.53 (m, 1H), 8.45 (m, 2 H)

(3) Title compound (yellow viscous oil)

NMR (CDCl₃) δ: 2.93 (d, J=5 Hz, MeNH), 2.96 (s, MeNCH₂ s), 2.97 (m, CH₂-pyridine), 3.50 (m, MeNCH₂), 6.52 (s, ═CHNO₂), 7.27 (dd, J=5 & 8 Hz, 1H), 7.57 (m, 1 H), 8.50 (m, 2 H), 9.67 (br, NH)

Example 381-Dimethylamino-1-(N-methyl-N-3-pyridylmethyl)-amino-2-nitroethylene(Compound 56) and1,1-bis(N-methyl-N-3-pyridylmethyl)amino-2-nitroethylene (Compound 57)##STR50##

A mixture of 2.0 g (0.012 mole) of1-dimethylamino-1-methylthio-2-nitroethylene and 1.5 g (0.012 mole) ofN-methyl-N-3-pyridylmethylamine was stirred at 120° C. for 40 minutes.The reaction mixture was subjected to column chromatography, elutionbeing carrid out with MeOH--CHCl₃ (1:10) to give two fractionscontaining the desired compounds, respectively. One of the fractions wasfurther purified by silica gel column chromatography using MeOH--CHCl₃(1:10) and acetone-CHCl₃ (2:1) in succesion, whereby 0.40 g of the titlecompound (Compound 56) was obtained as pale yellow crystals. The otherfraction was also chromatographed on a silica gel column and eluted withMeOH--CHCl₃ (1:10) and acetone-CHCl₃ (2:1) in that order to give 0.35 gof the title compound (Compound 57) as a yellow oil. (Compound 56)

m.p.: 103-105° C.

NMR (CDCl₃) δ: 2.81 (s, 3 H), 2.98 (s, 6 H), 4.44 (s, 3 H), 6.41 (s, 1H), 7.33 (dd, J=8.4 & 5.1 Hz, 1 H), 7.64 (dt, J=8.4 & 1.5 Hz, 1 H),8.4-8.7 (m, 2 H) IR (Nujol): 1545, 1520, 1450, 1300, 1265 cm⁻¹ (Compound57)

NMR (CDCl₃) δ: 2.83 (s, 6 H), 4.48 (s, 4 H), 6.52 (s, 1 H), 7.34 (dd,J=8.4. & 5.1 Hz, 2 H), 7.62 (dt, J=8.4 & 1.5 Hz, 2 H), 8.4-8.8 (m, 4 H)

Example 391-[N-(6-Chloro-3-pyridylmethyl)-N-methyl]amino-1-dimethylamino-2-nitroethylene(Compound 58) ##STR51##

A mixture of 1.6 g (0.0099 mole) of1-dimethylamino-1-methylthio-2-nitroethylene and 1.4 g (0.0089 mole) ofN-(6-chloro-3-pyridylmethyl)-N-methylamine was stirred at 80° C. for 3hours. The reaction mixture was subjected to silica gel columnchromatography using MeOH--CDCl₃ (1:10) twice and acetone-CHCl₃ (2:1)once to give 0.33 g of the title compound as pale yellow crystals.

m.p.: 110-112° C.

NMR (CDCl₃) δ: 2.79 (s, 3 H), 2.97 (s, 6 H), 4.40 (s, 2 H), 6.38 (s, 1H), 7.36 (d, J=8.4 Hz, 1 H), 7.72 (dd, J=8.4 & 2.4 Hz, 1 H), 8.30 (d,J=2.4 Hz, 1 H) IR (Nujol): 1545, 1520, 1460, 1300, 1260 cm⁻¹

Example 401-Amino-1-[N-(6-chloro-3-pyridylmethyl)-N-ethyl]-amino-2-nitroethylene(Compound 59) ##STR52##

(1) In 200 ml of EtOH was dissolved 9.68 g of1,1-bis-(methylthio)-2-nitroethylene with heating, and a solution of6.66 g (0.039 mole) of N-(6-chloro-3-pyridylmethyl)-N-ethylamine in 30ml of EtOH was added dropwise on reflux. After 45 hours of refluxing,the EtOH was distilled off and the residue was subjected to silica gel(420 g) column chromatography using EtOH--CHCl₃ (1:20) as an eluent. Theprocedure gave 2.28 g of crude1-[N-(6-chloro-3-pyridylmethyl)-N-ethyl]amino-1-methylthio-2-nitroethyleneas a brown oil.

NMR (CDCl₃) δ: 1.24 (t, J=7 Hz, CH₂ CH₃), 2.46 (s, MeS), 3.52 (q, J=7Hz, CH₂ CH₃), 4.72 (s, CH₂ -pyridine), 6.82 (s, ═CHNO₂), 7.31 (d, J=8Hz, 1 H), 7.57 (dd, J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H)

(2) In 30 ml of EtOH was dissolved 2.16 g of crude1-[N-(6-chloro-3-pyridylmethyl)-N-ethyl]amino-1-methylthio-2-nitroethyleneprepared in (1), followed by addition of 0.766 ml of 25% aqueousammonia. The mixture was stirred at room temperature for 3 hours. Thesolvent was distilled off and the residue was subjected to silica gel(200 g) column chromatography, elution being carried out withMeOH--CHCl₃ (1:5). The procedure gave 0.69 g of the title compound as apale yellow viscous oil. This product was triturated with ether,filtered and dried to give 0.57 g of the title compound as white powderycrystals.

m.p.:159-161° C.

NMR (CDCl₃ -DMSO-d₆ [4:1]) δ: 1.22 (t, J=7 Hz, CH₂ CH₃), 3.43 (q, CH₂CH₃), 4.62 (s, CH₂ -pyridine), 6.61 (s, ═CHNO₂), 7.38 (d, J=8 Hz, 1 H),7.62 (dd, J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H), 8.97 (br, NH₂) IR(Nujol): 1610, 1565, 1455, 1445, 1305, 1235 cm⁻¹

Example 41

1-[N-(6-Chloro-3-pyridylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylene(Compound 60) ##STR53##

The steps (1), (2) and (3) of Example 37 were repeated except thatN-(6-chloro-3-pyridylmethyl)-N-ethylamine was used in lieu ofN-methyl-N-[2-(3-pyridyl)ethyl]amine to give the following compounds inthe respective steps.

(1) N-(6-Chloro-3-pyridylmethyl)-N-ethyl-N-methylthiourea (yellowcrystals)

m.p.: 133-134° C.

NMR (CDCL₃) δ: 1.16 (t, J=7 Hz, CH₂ CH₃), 3.15 (d, J=5 Hz, MeN), 3.50(q, J=7 Hz, CH₂ CH₃), 5.12 (s, CH₂ -pyridine), 5.84 (br d, J=5 Hz, NH),7.30 (d, J=8 Hz, 1 H), 7.80 (dd, J=8 & 2 Hz, 1 H), 8.27 (d, J=2 Hz, 1 H)

(2) S-Methyl-N-(6-chloro-3-pyridylmethyl)-N-ethyl-N'-methylisothiourea(yellow brown oil)

NMR (CDCl₃) δ: 1.09 (t, J=7 Hz, CH₂ CH₃), 2.29 (s, MeS), 3.21 (s, MeN═),3.38 (q, J=7 Hz, CH₂ CH₃), 4.49 (s, CH₂ -pyridine), 7.27 (d, J=8 Hz, 1H), 7.61 (dd, J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H)

(3) Title compound (white crystals)

m.p.: 83-84° C.

NMR (CDCl₃) δ: 1.20 (t, J=7 Hz, CH₂ CH₃), 3.08 (d, J=5 Hz, MeNH), 3.18(q, J=7 Hz, CH₂ CH₃), 4.40 (s, CH₂ pyridine), 6.54 (s, ═CHNO₂), 7.39 (d,J=8 Hz, 1 H), 7.63 (dd, J=8 & 2 Hz, 1 H), 8.33 (d, J=2 Hz, 1 H), 9.79(br d, J=5 Hz, NH) IR (Nujol): 1595, 1530, 1455, 1340, 1270, 1240 cm⁻¹

Example 421-(N-(6-Methoxy-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 61) ##STR54##

In 20 ml of DMF was dissolved 0.67 g (0.0026 mole) of1-[N-(6-chloro-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylenefollowed by addition of 1.00 g of a 28% solution of sodium methoxide inmethanol. The mixture was stirred at 100° C. for 5.5 hours. The methanoland DMF were distilled off and the residue was diluted with aqueoussodium chloride solution and extracted with CH₂ Cl₂. The extract wasdried over MgSO₄ and the CH₂ Cl₂ was distilled off. The residue wassubjected to silica gel (230 g) column chromatography using MeOH--CHCl₃(1:5) as an eluent to give 0.22 g of a brown viscous oil. A small amountof ether was added to the oil and the mixture was cooled and triturated.The resulting crystals were diluted with ether, filtered and dried togive 0.128 g of the title compound as white--pale brown crystals.

m.p.: 77-78° C.

NMR (CDCl₃) δ: 2.75 (s, MeN), 3.07 (d, J=5 Hz, MeNH), 3.93 (s, OMe),4.30 (s, CH₂ -pyridine), 6.53 (s, ═CHNO₂), 6.78 (d, J=8 Hz, 1 H), 7.45(dd, J=8 & 2 Hz, 1 H), 8.05 (d, J=2 Hz, 1 H), 9.80 (br, NH) IR (Nujol):1605, 1455, 1310, 1250, 1025 cm⁻¹

Example 431-Methylamino-1-[N-methyl-N-(4-pyridylmethyl)]-amino-2-nitroethylene(Compound 62) ##STR55##

The steps (1), (2) and (3) of Example 37 were repeated except thatN-methyl-N-(4-pyridylmethyl)amine was used in lieu ofN-methyl-N-[2-(3-pyridyl)ethyl]-amine to give the following compounds inthe respective steps.

(1) N-Methyl-N'-methyl-N'-(4-pyridylmethyl)thiourea

m.p.: 123-124° C.

NMR (CDCl₃) δ: 3.07 (s, MeNCH₂), 3.16 (d, J=5 Hz, MeNH), 5.19 (s, CH₂),6.29 (br d, J=5 Hz, NH), 7.19 (m, 2 H), 8.52 (m, 2 H).

(2) S-Methyl-N-methyl-N'-methyl-N'-(4-pyridylmethyl)isothiourea (brownoil)

NMR (CDCl₃) δ: 2.30 (s, MeS), 2.87 (s, MeNCH₂, 3.27 (s, MeN═), 4.59 (s,CH₂), 7.18 (m, 2 H), 8.54 (m, 2 H)

(3) Title compound

m.p.: 145-146° C.

NMR (CDCl₃) δ: 2.88 (s, MeNCH₂), 3.07 (d, J=5 Hz, MeNH), 4.43 (s, CH₂),6.54 (s, ═CHNO₂), 7.21 (m, 2 H), 8.65 (m, 2 H), 9.78 (br, NH) IR(Nujol): 1600, 1565, 1455, 1435, 1410, 1320, 1260 cm⁻¹

Example 441-Methylamino-1-[N-methyl-N-(2-pyridylmethyl)]-amino-2-nitroethylene(Compound 63) ##STR56##

The steps (1), (2) and (3) of Example 37 were repeated except thatN-methyl-N-(2-pyridylmethyl)amine was used in lieu ofN-methyl-N-[2-(3-pyridyl)ethyl]-amine to give the following compounds inthe respective steps.

(1) N-Methyl-N'-methyl-N'-(2-pyridylmethyl)thiourea (yellow brownviscous oil)

NMR (CDCl₃) δ: 3.15 (d, J=5 Hz, MeNH), 3.31 (s, MeNCH₂), 4.90 (s, CH₂),7.15-7.6 (m, 3 H, pyridine-H₂ & NH), 7.73 (t, J=7 Hz, 1 H), 8.55 (d, J=5Hz, 1 H)

(2) S-Methyl-N-methyl-N'-methyl-N'-(2-pyridylmethyl)-isothiourea (brownoil)

NMR (CDCl₃), δ: 2.30 (s, MeS), 2.91 (s, MeCH₂), 3.28 (s, MeN═), 4.77 (s,CH₂), 7.05-7.45 (m, 2 H), 7.67 (m, 1 H), 8.56 (d, J=5 Hz, 1 H)

(3) Title compound

m.p.: 96-97° C.

NMR (CDCl₃) δ: 2.96 (s, MeNCH₂), 3.08 (d, J=5 Hz, MeNH), 4.53 (s, CH₂),6.57 (s, ═CHNO₂, 7.30 (m, 2 H), 7.78 (m, 1 H), 8.63 (m, 1 H), 9.61 (br,NH) IR (Nujol): 1580, 1545, 1425, 1380, 1280 cm⁻¹

Example 451-[N-methoxy-N-(3-pyridylmethyl)]amino-1-methylamino-2-nitroethylene(Compound 64) ##STR57##

The steps (1), (2) and (3) of Example 37 were repeated except thatO-methyl-N-(3-pyridylmethyl)-hydroxylamine was used in lieu ofN-methyl-N-[2-(3-pyridyl)ethyl]amine to give the following compounds inthe respective steps.

(1) N-Methoxy-N-(3-pyridylmethyl)-N'-methylthiourea (provide, however,that acetonitrile was used as the reaction solvent and the reaction wasconducted at 50° C. for 5 hours)

m.p.: 95-96° C.

NMR (CDCl₃) δ: 3.15 (d, J=5 Hz, 3 H), 3.63 (s, 3 H), 5.32 (s, 2 H),7.03-7.46 (br, NH), 7.27 (dd, J=8 & 5 Hz, 1 H), 7.86 (dt, J=8 & 2 Hz, 1H), 8.56 (dd, J=5 & 2 Hz, 1 H), 8.66 (d, J=2 Hz, 1 H).

(2) S-Methyl-N-methoxy-N-(3-pyridylmethyl)-N'-methyl-isothiourea (paleyellow oil)

NMR (CDCl₃) δ: 2.23 & 2.45 (each s, total 3 H), 3.26 & 3.32 (each s,total 3 H), 3.40 & 3.50 (each s, total 3 H), 4.08 & 4.52 (each s, total2 H), 7.20-7.43 (m, 1 H), 7.76 (m, 1 H), 8.50-8.76 (m, 2 H).

(3) Title compound

m.p. 100-101° C.

NMR (CDCl₃) δ: 3.18 (d, J=5 Hz, 3 H), 3.45 (s, 3 H), 4.30 (s, 2 H), 6.90(s, 1 H), 7.33 (dd, J=8 & 5 Hz, 1 H), 7.73 (dt, J=8 & 2 Hz, 1 H),8.56-8.73 (m, 2 H), 9.73 (br, NH) IR (Nujol): 1613, 1460, 1360, 1250,1080 cm⁻¹

Example 461-(N-Formyl-N-methyl)amino-1-[N-methyl-N-(3-pyridyl-methyl)]amino-2-nitroethylene(Compound 65) ##STR58##

In 10 ml of dry THF was suspended 0.1 g of petroleum ether-washed 60%sodium hydride, followed by addition of 0.51 g (0.0023 mole) of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene. Themixture was stirred at room temperature overnight. Then, underice-cooling, 0.6 g of formic acetic anhydride was added and the mixtureas stirred at that temperature for 1 hour. The solvent was distilled offand the residue was diluted with 30 ml of water, neutralized with NaHCO₃and extracted with CH₂ Cl₂ (30 ml×3). The extract was dried over MgSO₄,the CH₂ Cl₂ was removed by distillation and the residue was subjected tosilica gel column chromatography, elution being carried out withMeOH--CHCl₃ (1:5). The procedure gave 0.25 g of the title compound aspale yellow prisms.

m.p.: 97-98° C.

NMR (DMSO-d₆) δ: 2.93 (s, 3 H), 3.03 (s, 3 H), 4.62 (br, 2 H), 6.86 (s,1 H), 7.42 (dd, J=8 & 5 Hz, 1 H), 7.73 (br d, J=8 Hz, 1 H), 8.25 (s, 1H), 8.55 (br, 2 H) IR (Nujol): 1700, 1560, 1350, 1285, 1260, 890 cm⁻¹

Example 47 N² -Methoxy-2-nitro-N¹ -(3-pyridylmethyl)acetamidine Compound66) ##STR59##

To 3 ml of isobutyl alcohol was added 0.75 g (0.0033 mole) of1-methylthio-1-(3-pyridylmethyl)amino-2-nitroethylene, followed byaddition of 0.56 g of O-methylhydroxylamine hydrochloride at 100-110° C.Then, a solution of 0.93 ml of triethylamine in 1 ml of isobutyl alcoholwas added dropwise at the same temperature with stirring over a periodof 30 minutes. After completion of dropwise addition, the reactionmixture was allowed to cool to rcom temperature and the solvent wasdistilled off. The residue was purified by silica gel columnchromatography [eluents: MeOH--CHCl₃ (1:3) in the first run andMeOH--CHCl₃ (1:10) in the second run] to give 0.23 g of the titlecompound as yellow crystals.

m.p.: 77-78° C.

NMR (CDCl₃) δ: 3.86 (s, 3 H), 4.37 (d, J=6.3 Hz, 2 H), 5.04 (s, 2 H),5.2-5.8 (br, 1 H), 7.32 (dd, J=8.4 & 5.1 Hz, 1 H), 7.65 (dt, J=8.4 & 1.5Hz, 1 H), 8.4-8.8 (2 H, m).

Example 481-(2-Methoxyethyl)amino-1-[N-methyl-N-(3-pyridyl-methyl)]amino-2-nitroethylene(Compound 67) ##STR60##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(3-pyridylmethyl)amine and (2-methoxy)ethyl isothiocyanatewere used in lieu of N-ethyl-N-(3-pyridylmethyl)amine and methylisothiocyanate, respectively, to give the following compounds in therespective steps.

(1) N-(2-methoxyethyl)-N'-methyl-N'-(3-pyridylmethyl)-thiourea(colorless oil)

NMR (CDCl₃) δ: 3.06 (s, 3 H), 3.36 (s, 3 H), 3.57 (t, J=5.1 Hz, 2 H),3.91 (dt, J=5.1 & 5.1 Hz, 2 H), 5.21 (s, 2 H), 5.9-6.3 (br, 1 H), 7.28(dd, J=8.4 & 5.1 Hz, 1 H), 7.75 (dt, J=8.4 & 1.5 Hz, 1 H), 8.5-8.7 (m, 2H).

(2)S-Methyl-N-(2-methoxyethyl)-N'-methyl-N'-(3-pyridylmethyl)isothiourea(yellow oil)

NMR (CDCl₃) δ: 2.30 (s, 3 H), 2.88 (s, 3 H), 3.37 (s, 3 H), 3.4-3.8 (m,4 H), 4.59 (s, 2 H), 7.25 (dd, J=8.4 & 5.1 Hz, 1 H), 7.62 (dt, J=8.4 &1.5 Hz, 1 H), 8.4-8.7 (m, 2 H)

(3) Title compound

m.p. 55-57° C.

NMR (CDCl₃) δ: 2.79 (s, 3 H), 3.3-3.7 (m, 4 H), 3.41 (s, 3 H), 4.43 (s,2 H), 6.53 (S, 1 H), 7.35 (dd, J=8.4 & 1.5 Hz, 1 H), 7.60 (dt, J=8.4 &1.5 Hz, 1 H), 8.5-8.7 (m, 2 H), 9.4-9.9 (br, 1 H)

Example 491-[N-(4-Chlorobenzyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 68) ##STR61##

(1) In 50 ml of dry THF was dissolved 4.69 g (0.0205 mole) ofN-(4-chlorobenzyl)-N-methyl-N'-methylthiourea, followed by addition of0.82 g of 60% sodium hydride (oil). The mixture was refluxed for 1 hour.Then, under cooling with ice-water and stirring, 1.277 ml of methyliodide was added dropwise and after completion of dropwise addition, themixture was further stirred at room temperature for 45 minutes. The THFwas distilled off and the residue was diluted with water (about 50 ml),saturated with sodium chloride, and extracted with AcOEt (100 ml×3). Theextract was dried over MgSO₄ and the solvent was distilled off to give5.11 g of crudeS-methyl-N-(4-chlorobenzyl)-N-methyl-N'-methylisothiourea as acolorless--pale yellow oil.

NMR (CDCl₃) δ: 2.28 (s, MeS), 2.80 (s, MeNCH₂), 3.26 (s, MeN═), 4.53 (s,CH₂), 7.14 & 7.31 (each d, J=9 Hz, each 2 H)

(2) To 4.98 g (0.0205 mole) ofS-methyl-N-(4-chlorobenzyl)-N-methyl-N'-methylisothiourea prepared in(1) was added 25 ml of nitromethane and the mixture was refluxed for 6.5hours. The nitromethane was distilled off and the residue was subjectedto silica gel (240 g) column chromatography using MeOH--CHCl₃ (1:10) asan eluent to give 5.23 g of an orange-colored oil. To this oil wereadded small amounts of EtOH and ether and the mixture was cooled in adry ice-acetone bath and triturated to give crystals. After addition ofether, the crystals were collected by filtration, washed with ether anddried. The procedure gave 3.69 g of the title compound as pale yellowcyrstals.

m.p.: 98-99° C.

NMR (CDCl₃) δ: 2.79 (s, MeNCH₂), 3.05 (d, J=5 Hz, MeNH), 4.34 (s, CH₂),6.53 (s, ═CHNO₂), 7.17 & 7.38 (each d, J=8 Hz, each 2 H), 9.79 (br, NH)IR (Nujol): 1450, 1310, 1235, 1070, 1025 cm⁻¹

Example 50 1-Amino-1-(4-chlorobenzyl)amino-2-nitroethylene (Compound 69)##STR62##

To 2.59 g (0.01 mole) of1-(4-chlorobenzyl)amino-1-methylthio-2-nitroethylene were added 45 ml ofEtOH, 10 ml of THF and 1.02 g of 25% aqueous ammonia and the mixture wasstirred at an external temperature of 60° C. for 5.5 hours. During thisperiod, 1.02 g each of 25% aqueous ammonia was added after 1, 2 and 3hours of reaction. The reaction mixture was ice-cooled and stirred,whereupon crystals separated out. The crystals were collected byfiltration, washed with EtOH and ether in that order, and dried. Theprocedure gave 1.11 g of the title compound as white crystals.

m.p.: 215-216° C. (decompn.)

NMR (DMSO-d₆) δ: 4.47 (d, J=7 Hz, CH₂), 6.45 (s, ═CHNO₂), 7.34 & 7.44(each d, J=9 Hz, each 2 H), 8.02 (br, NH₂) 9.25 (br, NH) IR (Nujol):3100, 1560, 1430, 1405, 1195, 1030 cm⁻¹

Example 51 1-(4-Chlorobenzyl)amino-1-methylamino-2-nitroethylene(Compound 70) ##STR63##

In 100 ml of EtOH on reflux was dissolved 2.59 g (0.01 mole) of1-(4-chlorobenzyl)amino-1-methylthio-2-nitroethylene, and with refluxingcontinued, a solution of 1.94 g of 40% aqueous methylamine solution in10 ml of EtOH was added dropwise over a period of 50 minutes. Aftercompletion of dropwise addition, the mixture was further refluxed for 15minutes, at the end of which time it was cooled with ice-water,whereupon crystals separated out. The crystals were collected byfiltration, washed with EtOH and ether in that orsder, and dried. Theprocedure gave 1.66 g of the title compound as white crystals.

m.p.: 219-220° C. (decompn.)

NMR (DMSO-d₆) δ: 2.88 (br d, J=3 Hz, Me), 4.43 (d, J=6 Hz, CH₂), 6.43(s, ═CHNO₂), 7.40 (s, 4 H), 7.7 (br, MeNH), 9.9 (br, HNCH₂) IR (Nujol):1455, 1425, 1375, 1360, 1215, 995 cm⁻¹

Example 52 1-(4-Chlorobenzyl)amino-1-dimethylamino-2-nitroethylene(Compound 71) ##STR64##

In 100 ml of EtOH was dissolved 2.59 g (0.01 mole) of1-(4-chlorobenzyl)amino-1-methylthio-2-nitroethylene with heating. Then,with refluxing and stirring, a solution of 2.25 g of 50% aqueousdimethylamine solution in 10 ml of EtOH was added dropwise over a periodof 35 minutes. After completion of dropwise addition, the mixture wasfurther stirred and refluxed for 2.5 hours. The solvent was thendistilled off and the residue was diluted with ether and triturated,whereupon crystals separated. After addition of EtOH and ether (about1:5), the crystals were collected by filtration, washed with ether anddried. The procedure gave 1.21 g of the title compound as whitecrystals.

m.p.: 133-135° C.

NMR (CDCl₃) δ: 2.91 (s, Me₂ N), 4.45 (d, J=6 Hz, CH₂), 6.51 (s, ═CHNO₂),7.30 (s, 4 H), 9.79 (br, NH) IR (Nujol): 1620, 1500, 1435, 1420, 1370,1220, 1195 cm⁻¹

Example 531-Dimethylamino-1-[N-formyl-N-(3-pyridylmethyl)]-amino-2-nitroethylene(Compound 72) ##STR65##

In 10 ml of dry THF was suspended 0.1 g of 60% sodium hydride (oil)followed by addition of 0.56 g (0.0025 mole) of1-dimethylamino-1-(3-pyridylmethyl)-amino-2-nitroethylene, and themixture was stirred at room temperature overnight. Then, underice-cooling, 0.7 g of formic acetic anhydride was added, followed bystirring at the same temperature for 2 hours. The solvent was distilledoff and the residue was diluted with 30 ml of water, neutralized withNaHCO₃ and extracted with CH₂ Cl₂ (30 ml×3). The extract was dried overMgSO₄, the solvent was distilled off and the residue was subjected tosilica gel column chromatography using MeOH--CHCl₃ (1:5) as an eluent.The procedure gave 0.2 g of the title compound as a pale yellow viscousoil.

NMR (DMSO-d₆) δ: 2.90 (s, 6 H), 4.40-5.06 (m, 2 H), 6.73 (s, 1 H), 7.33(dd, J=8 & 5 Hz, 1 H), 7.75 (br d, J=8 Hz, 1 H), 8.26 (s, 1 H), 8.55(br, 2 H) IR (neat): 1685, 1570, 1500, 1350, 1270 cm⁻¹

Example 541-Methylamino-1-[N-methyl-N-(2-pyrazinyl)methyl]amino-2-nitroethylene(Compound 73) ##STR66##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(2-pyrazyl)methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-[(2-pyrazyl)methyl]thiourea

m.p.: 123-124° C.

NMR (CDCl₃) δ: 3.17 (d, J=5 Hz, 3 H), 3.26 (s, 2 H), 5.12 (s, 2 H), 6.42(br, 1 H), 8.53 (s, 2 H), 8.72 (s, 1 H)

(2) S-Methyl-N-methyl-N'-methyl-N'-[(2-pyrazyl)methyl]-isothiourea (paleyellow oil)

NMR (CDCl₃) δ: 2.32 (s, 3 H), 2.98 (s, 3 H), 3.26 (s, 3 H), 4.76 (s, 2H), 8.45-8.66 (m, 3 H)

(3) Title compound

m.p.: 132-133° C.

NMR (CDCl₃) δ: 2.93 (s, 3 H), 3.09 (d, J=5 Hz, 3 H), 4.56 (s, 2 H), 6.60(s, 1 H), 8.62 (s, 3 H), 9.60 (br, 1 H) IR (Nujol): 3150, 1580, 1410,1280, 1240, 1020, 990 cm⁻¹

Example 551-(2,2-Dimethyl-1-hydrazino)-1-[N-methyl-N-(3-pyridylmethyl]amino-2-nitroethylene(Compound 74) ##STR67##

A mixture of 4.3 g (0.024 mole) of1-(2,2-dimethyl-1-hydrazino)-1-methylthio-2-nitroethylene and 3.6 g ofN-methyl-N-(3-pyridylmethyl)amine was stirred at 90-100° C. for 4 hours,after which it was subjected to silica gel column chromatography usingMeOH--CHCl₃ (1:10) as an eluent. The resulting crystals were washed withether and dried to give 0.7 g of the title compound. NMR of this productshowed that it was a 3:2 mixture of the title compound and N²-dimethylamino-N¹ -methyl-2-nitro-N¹ -(3-pyridylmethyl)acetamidine.

m.p.: 80-82° C.

NMR (CDCl₃) δ: 2.40 (s, 2.4 H), 2.59 (s, 3.6 H), 2.87 (s, 1.2 H), 2.90(s, 1.8 H), 4.61 (s, 0.8 H), 4.63 (s, 1.2 H), 6.00 (s, 0.8 H), 6.47 (s,0.6 H), 7.15-7.45 (m, 1 H), 7.45-7.80 (m, 1 H), 8.45-8.70 (m, 2 H),10.1-10.5 (br s, 0.6 H) IR (Nujol): 3130, 1585, 1570, 1445, 1425 cm⁻¹

Example 561-Amino-1-[N-(6-chloro-3-pyridylmethyl)-N-n-propyl]-amino-2-nitroethylene(Compound 75) ##STR68##

In 40 ml of EtOH was dissolved 2.83 g (0.0094 mole) of1-[N-(6-chloro-3-pyridylmethyl)-N-n-propyl]-amino-1-methylthio-2-nitroethylenefollowed by addition of 0.96 ml of 25% aqueous ammonia. The mixture wasstirred at room temperature for 3 hours. The resulting crystals werecollected by filtration, washed with small amounts of EtOH and ether inthat order, and dried to give 1.35 g of the title compound as paleyellow crystals.

m.p: 185-186° C. (decompn.)

NMR (DMSO-d₆) δ: 0.87 (t, J=7 Hz, CH₂ CH₃), 1.59 (sextet, J=7 Hz, CH₂CH₃), 3.31 (t, J=7 Hz, NCH₂ CH₂), 4.68 (s, CH₂ -pyridine), 6.59 (s,═CHNO₂), 7.50 (d, J=8 Hz, 1 H), 7.71 (dd, J=8 & 2 Hz, 1 H), 8.31 (d, J=2Hz, 1 H), 8.99 (br, NH₂) IR (Nujol): 1615, 1550, 1455, 1335, 1320, 1300,1285 cm⁻¹

Example 571-[N-(6-Chloro-3-pyridylmethyl)-N-n-propyl]-amino-1-methylamino-2-nitroethylene(Compound 76) ##STR69##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(6-chloro-3-pyridylmethyl)-N-n-propylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(6-Chloro-3-pyridylmethyl)-N-n-propyl-N'-methylthiourea (paleyellow crystals)

m.p.: 95-96° C.

NMR (CDCl₃) δ: 0.89 (t, J=8 Hz, CH₂ CH₃), 1.63 (sextet, J=8 Hz, CH₂CH₃), 3.17 (d, J=5 Hz, MeN), 3.36 (t, J=8 Hz, CH₂ CH₂ N), 5.16 (s, CH₂-pyridine), 5.87 (br q, J=5 Hz, NH), 7.30 (d, J=8 Hz, 1 H), 7.78 (dd,J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H)

(2)S-Methyl-N-(6-chloro-3-pyridylmethyl)-N-n-propyl-N'-methylisothiourea(yellow oil)

(provided, however, that after addition of 60% sodium hydride (oil), themixture was stirred at 50° C. for 1 hour.)

NMR (CDCl₃) δ: 0.85 (t, J=7 Hz, CH₂ CH₃), 1.55 (sextet, J=7 Hz, CH₂CH₃), 2.26 (s, MeS), 3.21 (s, MeN═), 3.29 (t, J=7 Hz, CH₂ CH₂ N), 4.52(s, CH₂ -pyridine), 7.26 (d, J=8 Hz, 1 H), 7.60 (dd, J=8 & 2 Hz, 1 H),8.30 (d, J=2 Hz, 1 H)

(3) Title compound (pale yellow--pale brown crystals) (provided,however, that the reaction mixture was refluxed in nitromethane for 34hours.)

m.p.: 102-103° C.

NMR (CDCl₃) δ: 0.88 (t, J=7 Hz, CH₂ CH₃), 1.63 (sextet, J=7 Hz, CH₂CH₃), 3.04 (t, J=7 Hz, CH₂ CH₂ N), 3.08 (d, J=5 Hz, MeN), 4.40 (s, CH₂-pyridine), 6.54 (s, ═CHNO₂), 7.38 (d, J=8 Hz, 1 H), 7.60 (dd, J=8 & 2Hz, 1 H), 8.33 (dd, J=2 Hz, 1 H), 9.78 (br q, J=5 Hz, NH) IR (Nujol):1590, 1520, 1450, 1350, 1270, 1245, 1095 cm⁻¹

Example 581-[N-(6-Chloro-3-pyridylmethyl)-N-i-propyl]amino-1-methylamino-2-nitroethylene(Compound 77) ##STR70##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(6-chloro-3-pyridylmethyl)-N-i-propylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(6-Chloro-3-pyridylmethyl)-N-i-propyl-N'-methylthiourea (paleyellow crystals)

m.p.: 92-93° C.

NMR (CDCl₃) δ: 1.17 (d, J=7 Hz, Me₂ CH), 3.12 (d, J=5 Hz, MeN), 4.87 (s,CH₂), 5.08 (septet, J=7 Hz, Me₂ CH), 5.80 (br q, J=5 Hz, NH), 7.30 (d,J=8 Hz, 1 H), 7.65 (dd, J=8 & 2 Hz, 1 H), 8.27 (d, J=2 Hz, 1 H)

(2)S-Methyl-N-(6-chloro-3-pyridylmethyl)-N-i-propyl-N'-methylisothiourea(pale brown oil)

(provided, however, that after addition of 60% sodium hydride (oil), themixture was stirred at 50° C. for 1 hour.)

NMR (CDCl₃) δ: 1.20 (d, J-7 Hz, Me₂ CH), 2.23 (s, MeS), 3.10 (s, MeN═),4.24 (s, CH₂ -pyridine), 4.44 (septet, J=7 Hz, Me₂ CH), 7.23 (d, J=8 Hz,1 H), 7.56 (dd, J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H)

(3) Title compound (white--pale brown crystals)

(provided, however, that the reaction mixture was refluxed innitromethane for 130 hours.)

m.p.: 119-120° C.

NMR (CDCl₃) δ: 1.31 (d, J=7 Hz, Me₂ CH), 3.04 (d, J=5 Hz, MeN), 3.79(septet, J=7 Hz, Me₂ CH), 4.20 (s, CH₂), 6.56 (s, ═CHNO₂), 7.30 (d, J=8Hz, 1 H), 7.56 (dd, J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H), 9.78 (br q,J=5 Hz, NH) IR (Nujol): 1590, 1450, 1360, 1335, 1270, 1235, 1105 cm⁻¹

Example 591-[N-(6-Chloro-3-pyridyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 78) ##STR71##

(1) In 50 ml of acetonitrile, 4.0 g (0.028 mole) of2-chloro-5-methylaminopyridine and 3.7 g of methyl isothiocyanate wererefluxed for 52.5 hours and the reaction mixtrue was concentrated. Tothe residue were added 30 ml of ice-water and 2 ml of 3N-HCl, followedby extraction with AcOEt (50 ml×3). The extracts were pooled, washedsuccessively with 3N-HCl (4 times), aqueous sodium chloride solution (4times) and aqueous sodium hydrogen carbonate solution (once), and driedover MgSO₄. The AcOEt was distilled off under reduced pressure and afteraddition of ether, the crystals were collected by filtration and diredto give 2.8 g of N-(6-chloro-3-pyridyl)-N-methyl-N'-methylthiourea aswhite crystals.

m.p.: 87.5-88° C.

NMR (CDCl₃) δ: 3.09 (d, J=4.5 Hz, 3 H), 3.65 (s, 3 H), 5.3-6.0 (m, 1 H),7.47 (d, J=8.4 Hz, 1 H), 7.61 (dd, J=8.4 & 2.4 Hz, 1 H), 8.33 (d, J=2.4Hz, 2 H)

(2) In 10 ml of dry tetrahydrofuran was suspended 0.9 g of 60% sodiumhydride (oil) which had been washed twice with petroleum ether, and withstirring, a solution of 2.5 g (0.012 mole) ofN-(6-chloro-3-pyridyl)-N-methyl-N'-methylthiourea in 30 ml of drytetrahydrofuran was added dropwise. After completion of dropwiseaddition, the mixture was stirred at 50° C. for 0.5 hour. Then, at roomtemperature, 2.2 g of methyl iodide was added dopwise and the mixturewas further stirred for 3 hours. The reaction mixture was concentratedunder reduced pressure and after addition of 50 ml of iced water and 3ml of 3N-HCl, the concentrate was extracted with AcOEt (50 ml×3). Theextracts were pooled, washed with water (twice) and dried over MgSO₄.Finally, the AcOEt was distilled off under reduced pressure to recover2.6 g of crudeS-methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-methylisothiourea as a brownoil.

NMR (CDCl₃) δ: 2.07 & 2.38 (each s, 3 H), 3.06 & 3.27 (each s, 3 H),3.17 & 3.30 (each s, 3 H), 6.9-7.6 (m, 2 H), 7.90 & 8.24 (each d, J=3.0Hz, 1 H)

(3) In 40 ml of nitromethane, 2.6 g (0.011 mole) ofS-methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-methylisothiourea wasrefluxed for 63 hours. The reaction mixture was then concentrated andthe residue was subjected to silica gel column chromatography usinghexane-acetone (1:2) as an eluent. The resulting crystals were washedwith ether and dried to give 1.3 g of the title compound as pale yellowcrystals.

m.p.: 108-109° C.

NMR (CDCl₃) δ: 2.75 (d, J=5.1 Hz, 3 H), 3.30 (s, 3 H), 6.63 (s, 1 H),7.2-7.6 (m, 2 H), 8.2-8.3 (m, 1 H), 9.6-10.3 (m, 1 H)

IR (Nujol): 3120, 1600 cm⁻¹

Example 60 1-Methylamino-1-[N-methyl-N-(3-pyridyl)]amino-2-nitroethylene(Compound 79) ##STR72##

The steps (1), (2) and (3) of Example 59 were repeated except that3-methylaminopyridine was used in lieu of 2-chloro-5-methylaminopyridineto give the following compounds in the respective steps.

(1) N-Methyl-N'-methyl-N'-(3-pyridyl)thiourea (white crystals)

m.p.: 93-94° C.

NMR (CDCl₃) δ: 3.08 (d, J=4.5 Hz, 3 H), 3.69 (s, 3 H), 5.2-5.8 (m, 1 H),7.47 (dd, J=8.1 & 4.7 Hz, 1 H), 7.64 (dm, J=8.4 & 2.3 Hz, 1 H), 8.4-8.8(m, 2 H)

(2) S-Methyl-N-methyl-N'-methyl-N'-(3-pyridyl)isothiourea (red brownoil)

NMR (CDCl₃) δ: 2.01 & 2.37 (each s, 3 H), 3.05 & 3.27 (each s, 3 H),3.17 & 3.29 (each s, 3 H), 6.9-7.6 (m, 2 H), 8.0-8.6 (m, 2H)

(3) Title compound (pale brown crystals)

m.p.: 113-114° C.

NMR (DMSO-d₆) δ: 2.66 (d, J=5.1 Hz, 3 H), 3.29 (s, 3 H), 6.53 (s, 1 H),7.41 (dd, J=8.4 & 4.5 Hz, 1 H), 7.5-7.8 (m, 1 H), 8.2-8.7 (m, 2 H),9.4-10.0 (m, 1 H)

IR (Nujol): 3190, 3140, 1595 cm⁻¹

Example 611-[N-(6-Chloro-3-pyridylmethyl)-N-methyl]amino-1-ethylamino-2-nitroethylene(Compound 80) ##STR73##

Using N-(6-chloro-3-pyridylmethyl)-N-methylamine and ethylisothiocyanate in lieu of N-ethyl-N-(3-pyridylmethyl)amine and methylisothiocyanate, respectively, the reaction steps (1), (2) and (3) ofExample 13 were followed to give the following compounds in therespective steps.

(1) N-(6-Chloro-3-pyridylmethyl)-N-ethyl-N-methylthiourea (whitecrystals)

m.p. 82-83° C.

NMR (CDCl₃) δ: 1.24 (t, J=7 Hz, CH₂ CH₃), 3.04 (s, MeN), 3.72 (dq, J=5 &7 Hz, CH₂ CH₃), 5.22 (s, CH₂ -pyridine), 5.66 (br, NH), 7.33 (d, J=8 Hz,1H), 7.79 (dd, J=8 & 2 Hz, 1H), 8.33 (d, J=2 Hz, 1 H)

(2) S-Methyl-N-(6-chloro-3-pyridylmethyl)-N'-ethyl-N-methylisothiourea(brown oil)

NMR (CDCl₃) δ: 1.12 (t, J=7 Hz, CH₂ CH₃), 2.30 (s, MeS), 2.87 (s,MeNCH₂), 3.51 (q, J=7 Hz, CH₂ CH₃), 4.52 (s, CH₂ -pyridine), 7.30 (d,J=8 Hz, 1 H), 7.62 (dd, J=8 & 2 Hz, 1 H), 8.33 (d, J=2 Hz, 1 H)

(3) Title compound (white--pale yellow crystals)

m.p.: 132-133° C.

NMR (CDCl₃) δ: 1.33 (t, J=7 Hz, CH₂ CH₃), 2.80 (s, MeN), 3.38 (dq, J=5 &7 Hz, CH₂ CH₃), 4.40 (s, CH₂ -pyridine), 6.49 (s, =CHNO₂), 7.38 (d, J=8Hz, 1 H), 7.59 (dd, J=8 & 2 Hz, 1 H), 8.30 (d, J=2 Hz, 1 H), 9.51 (br t,J=5 Hz, NH)

IR (Nujol): 1600, 1535, 1445, 1305, 1290 cm⁻¹

Example 621-[N-(2,6-Dimethyl-4-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 81) ##STR74##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(2,6-dimethyl-4-pyridylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(2,6-dimethyl-4-pyridylmethyl)-N-methyl-N'-methylthiourea (whitecrystals)

m.p.: 207-208° C.

NMR (CDCl₃) δ: 2.49 (s, pyridine-Me×2), 3.09 (s, MeNCH₂), 3.18 (d, J=5Hz, MeNH), 5.10 (s, CH₂ -pyridine), 5.91 (br q, J=5 Hz, NH), 6.86 (s,pyridine-H₂)

(2)S-Methyl-N-(2,6-dimethyl-4-pyridylmethyl)-N-methyl-N'-methylisothiourea(brown oil)

(provide, however, that after addition of 60% sodium hydride (oil), themixtrue was stirred at 50° C. for 1 hour and at reflux temperature for 1hours.)

NMR (CDCl₃) δ: 2.30 (s, MeS), 2.50 (s, pyridien-Me×2), 2.86 (s, MeNH),3.27 (s, MeN=), 4.53 (s, pyridine-CH₂), 6.84 (s, pyridine-H₂)

(3) Title compound (white crystals)

m.p.: 131-133° C.

NMR (CDCl₃) δ: 2.53 (s, pyridine-Me×2), 2.87 (s, MeNCH₂), 3.05 (d, J=5Hz, MeNH), 4.34 (s, CH₂), 6.54 (s, =CHNO₂), 6.83 (s, pyridine-H₂)

IR (Nujol): 1570, 1460, 1395, 1310, 1230 cm⁻¹

Example 631-[N-(2-chloro-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 82) ##STR75##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(2-chloro-3-pyridylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(2-chloro-3-pyridylmethyl)-N-methyl-N'-methylthiourea (whitecrystals)

m.p.: 143-144° C.

NMR (CDCl₃) δ: 3.17 (s, MeNCH₂), 3.18 (d, J=5 Hz, MeNH), 5.29 (s, CH₂),5.98 (br q, J=5 Hz, NH), 7.26 (dd, J=8 & 5 Hz, 1 H), 7.66 (d, J=8 & 1Hz, 1 H), 8.31 (dd, J=5 & 1 Hz, 1 H)

(2) S-Methyl-N-(2-chloro-3-pyridylmethyl)-N-methyl-N'-methylisothiourea(pale yellow oil)

(provided, however, that after addition of 60% sodium hydride (oil), themixture was stirred at 50° C. for 1 hour.)

NMR (CDCl₃) δ: 2.29 (s, MeS), 2.95 (s, MeNCH₂), 3.26 (s, MeN=), 4.67 (s,CH₂ -pyridine), 7.24 (dd, J=8 & 5 Hz, 1 H), 7.62 (dd, J=8 & 1 Hz, 1 H),8.32 (dd, J=5 & 1 Hz, 1 H)

(3) Title compound (pale yellow crystals)

(provided, however, that the reaction mixture was refluxed innitromethane for 2.25 hours)

As determined by NMR, the purity of this product was found to be about75%.

m.p.: 106-113° C.

NMR (CDCl₃) δ: (for the title compound only) 2.90 (s, MeNCH₂), 3.04 (d,J=5 Hz, MeNH), 4.50 (s, CH₂), 6.54 (s, =CHNO₂), 7.37 (dd, J=8 & 5 Hz),7.68 (dd, J=8 & 1 Hz), 8.43 (dd, J=5 & 1 Hz), 9.78 (br q, J=5 Hz, NH)

IR (Nujol): 1560, 1450, 1405, 1310, 1260 cm⁻¹

Example 641-(6-Chloro-3-pyridylmethyl)amino-1-methylamino-1-methylamino-2-nitroethylene(Compound 25) ##STR76##

The steps (1), (2) and (3) of Example 8 were repeated except that6-chloro-3-pyridylmethylamine was used in lieu ofN-methyl-N-3-pyridylmethylamine to give the following compounds in therespective steps.

(1) N-(6-Chloro-3-pyridylmethyl)-N'-methylthiourea (white crystals)

m.p.: 133-134° C.

NMR (CDCl₃) δ: 3.01 (d, J=5 Hz, Me), 4.80 (d, J=6 Hz, CH₂), 7.25 (br,NHCH₃), 7.32 (d, J=8 Hz, 1 H), 7.66 (br t, J=6 Hz, NHCH₂), 7.78 (dd, J=8& 2 Hz, 1H), 8.37 (d, J=2 Hz, 1 H)

(2) S-Methyl-N-(6-chloro-3-pyridylmethyl)-N'-methylisothiourea (oil)

NMR (CDCl₃) δ: 2.39 (s, MeS), 2.93 (s, MeN), 4.22 (br, NH), 4.50 (s,CH₂), 7.27 (d, J=8 Hz, 1 H), 7.69 (dd, J=8 & 2 Hz, 1 H), 8.39 (d, J=2Hz, 1 H)

(3) Title compound (white--pale yellow crystals)

This product was found to be in agreement with Compound 28 according toExample 10 in melting point, NMR, IR and TLC Rf.

Example 651-Methylamino-1-[N-methyl-N-(2-thiazolyl)]amino-2-nitroethylene(Compound 83) ##STR77##

The steps (1), (2) and (3) of Example 59 were repeated except that2-methylaminothiazole was used in lieu of 2-chloro-5-methylaminopyridineto obtain the following compounds in the respective steps.

(1) N-Methyl-N'-methyl-N'-(2-thiazolyl)thiourea (white crystals)

(provided that the reaction mixture was refluxed in toluene for 8 hoursand the product was purified by silica gel column chromatography)

m.p.: 68-69° C.

NMR (CDCl₃) δ: 3.24 (d, J=4 Hz, 3 H), 3.95 (s, 3 H), 6.69 (d, J=4 H, 1H), 7.42 (d, J=4 Hz, 1 H), 11.95 (br, 1 H)

(2) S-Methyl-N-methyl-N'-methyl-N'-(2-thiazolyl)isothiourea (pale yellowoil)

NMR (CDCl₃) δ: 2.33 (s, 3 H), 3.41 (s, 3 H), 3.75 (s, 3 H), 6.74 (d, J=4Hz, 1 H), 7.40 (d, J=4 Hz, 1 H)

(3) Title compound (pale yellow crystals)

(provided that the reaction was conducted for 25 hours and the productwas concentrated to give crystals)

m.p.: 155-156° C.

NMR (CDCl₃): 2.98 (d, J=5 Hz, 3 H), 3.42 (s, 3 H), 6.71 (s, 3 H), 6.91(d, J=4 Hz, 1 H), 7.36 (d, J=4 Hz, 1 H), 9.87 (br, 1 H)

IR (Nujol): 3050, 1610, 1500, 1400, 1320, 1260, 1100, 1010 cm⁻¹

Example 661-Methylamino-1-[N-methyl-N-(6-methyl-3-pyridyl)]amino-2-nitroethylene(Compound 84) ##STR78##

(1) In a solution of 1.9 g NaOH in 30 ml water was dissolved 4.3 g (0.02mole) of 2-methyl-5-methylaminopyridine oxalate and the solution wasextracted with AcOEt (50 ml, 30 ml×2). The AcOEt layers were combined,washed with water and dried over MgSO₄. After concentration, 30 ml oftoluene and 1.8 g of methyl isothiocyanate were added to the concentrateand the mixture was refluxed for 8 hours. Then, 0.8 g of methylisothiocyanate was further added and the mixture was refluxed for 7.5hours. The reaction mixture was cooled to -20° C. and the resultingcrystals were collected by filtration, washed with cold toluene anddried. The procedure gave 2.2 g ofN-methyl-N'-methyl-N'-(6-methyl-3-pyridyl)thiourea as white crystals.

m.p.: 134-135° C.

NMR (CDCl₃) δ: 2.62 (3 H, s), 3.06 (3 H, d, J=4.2 Hz), 3.66 (3 H, s),5.2-5.9 (1 H, m, NH), 7.30 (1 H, d, J=8.4 Hz), 7.49 (1 H, dd, J=8.4 &2.7 Hz), 8.42 (1 H, d, J=2.7 Hz)

(2) The reaction procedure of Example 59 (2) was repeated except thatN-methyl-N'-methyl-N'-(6-methyl-3-pyridyl)thiourea was used in lieu ofN-(6-chloro-3-pyridyl)-N-methyl-N'-methylthiourea to giveS-methyl-N-methyl-N'-methyl-N'-(6-methyl-3-pyridyl)isothiourea as oil.

NMR (CDCl₃) δ: 2.01 & 2.37 (3 H, each s), 2.49 & 2.53 (3 H, each s),3.04 & 3.17 & 3.24 & 3.30 (6 H, each s), 6.9-7.6 (2 H, m), 8.0-8.5 (1 H,m)

(3) The reaction procedure of Example 59 (3) was repeated except thatS-methyl-N-methyl-N'-methyl-N'-(6-methyl-3-pyridyl)isothiourea was usedin lieu of S-methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-methylisothioureaand that the reaction was conducted for 23 hours. The procedure gave thetitle compound as yellow-brown crystals.

m.p.: 120-121° C.

NMR (CDCl₃) δ: 2.57 (3 H, s), 2.65 (3 H, d, J=5.4 Hz), 3.30 (3 H, s),6.67 (1 H, s), 7.23 (1 H, d, J=8.7 Hz), 7.39 (1 H, dd, J=8.4 & 2.7 Hz),8.38 (1 H, d, J=2.7 Hz), 9.7-10.4 (1 H, m, NH)

IR (Nujol): 3110, 1600 cm⁻¹

Example 671-[N-(6-chloro-3-pyridyl)-N-methyl]amino-1-ethylamino-2-nitroethylene(Compound 85) ##STR79##

The steps (1), (2) and (3) of Example 59 were repeated except that ethylisothiocyanate was used in lieu of methyl isothiocyanate to give thefollowing compounds in the respective steps.

(1) N-(6-Chloro-3-pyridyl)-N-methyl-N'-ethylthiourea (yellow oil)

(provided that the reaction mixture was refluxed in toluene for 78 hoursand the product was purified by silica gel column chromatography)

NMR (CDCl₃) δ: 1.13 (3 H, t, J=6.6 Hz), 3.4-3.9 (2 H, m), 3.63 (3 H, s),5.0-5.8 (1 H, br), 7.46 (1 H, d, J=8.4 Hz), 7.61 (1 H, dd, J=8.4 & 2.7Hz), 8.33 (1 H, d, J=2.7 Hz)

(2) S-Methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-ethylisothiourea (yellowoil)

NMR (CDCl₃) δ: [main component . . . 76%] 1.23 (3 H, t, J=7.2 Hz), 2.04(3 H, s), 3.28 (3 H, s), 3.53 (2 H, q, J=7.2 Hz), 6.9-7.6 (2 H, m), 8.22(1 H, d, J=2.7 Hz) [a small amount of isomer . . . 24%], 2.73 (3 H, s),3.13 (3 H, s), 3.1-3.4 (2 H, m), 7.89 (1 H, d, J=2.7 Hz)

(3) Title compound (pale yellow crystals)

(provided that the reaction was conducted for 64 hours and the reactionmixture was concentrated to give crystals)

m.p.: 118-119° C.

NMR (CDCl₃) δ: 1.19 (3 H, t, J=7.5 Hz), 3.00 (2 H, dt, J=7.5 & 6.3 Hz),3.29 (3 H, s), 6.61 (1 H, s), 7.3-7.6 (2 H, m), 8.1-8.4 (1 H, m)

IR (Nujol): 3200, 1605, 1375, 1300 cm⁻¹

Example 681-[N-(5-Bromo-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 86) ##STR80##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-(5-bromo-3-pyridylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(5-Bromo-3-pyridylmethyl)-N-methyl-N'-methylthiourea (pale yellowoil)

(provided that the product was purified by silica gel columnchromatography)

NMR (CDCl₃) δ: 3.05 (s, MeNCH₂), 3.19 (d, J=5 Hz, MeNH), 5.24 (s, CH₂),5.88 (br q, J=5 Hz, NH), 7.91 (m, 1 H), 8.47 (d, J=2 Hz, 1 H), 8.62 (d,J=2 Hz, 1 H)

(2) S-Methyl-N-(5-bromo-3-pyridylmethyl)-N-methyl-N'-methylisothiourea(oil)

NMR (CDCl₃) δ: 2.31 (s, MeS), 2.88 (s, MeNCH₂), 3.26 (s, MeN=), 4.56 (s,CH₂), 7.77 (m, 1 H), 8.47 (d, J=2 Hz, 1 H), 8.60 (d, J=2 Hz, 1 H)

(3) Title compound (pale yellowish brown crystals)

m.p.: 116-117° C.

NMR (CDCl₃) δ: 2.84 (s, MeNCH₂), 3.08 (d, J=5 Hz, MeNH), 4.42 (s, CH₂),6.54 (s, =CHNO₂), 7.76 (m, 1 H), 8.48 (d, J=2 Hz, 1H), 8.68 (d, J=2 Hz,1 H), 9.72 (br q, J=5 Hz, NH)

IR (Nujol): 1595, 1465, 1425, 1405, 1260 cm⁻¹

Example 691-Methylamino-1-[N-methyl-N-(2-methylthio-3-pyridylmethyl)]amino-2-nitroethylene(Compound 87) ##STR81##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-(2-methylthio-3-pyridylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-(2-methylthio-3-pyridylmethyl)thiourea(white--pale yellow crystals)

m.p.: 105-106° C.

NMR (CDCl₃) δ: 2.61 (s, MeS), 3.15 (d, J=5 Hz, MeNH), 3.17 (s, MeNCH₂),5.00 (s, CH₂), 5.77 (br, NH), 7.01 (dd, J=8 & 5 Hz, 1 H), 7.36 (dd, J=8& 1 Hz, 1 H), 8.40 (dd, J=5 & 1 Hz, 1 H)

(2)S-Methyl-N-methyl-N'-methyl-N'-(2-methylthio-3-pyridylmethyl)isothiourea(yellow oil)

NMR (CDCl₃) δ: 2.28 (s, MeS), 2.59 (s, pyridine-SMe), 2.89 (s, MeNCH₂),3.27 (s, MeN=), 4.53 (s, CH₂), 6.98 (dd, J=8 & 5 Hz, 1 H), 7.40 (dd, J=8& 1 Hz, 1 H), 8.37 (dd, J=5 & 1 Hz, 1 H)

(3) Title compound (pale yellow crystals)

m.p.: 131-132° C.

NMR (CDCl₃) δ: 2.60 (s, MeS), 2.84 (s, MeNCH₂), 3.03 (d, J=5 Hz, MeNH),4.34 (s, CH₂), 6.57 (s, =CHNO₂), 7.07 (dd, J=8 & 5 Hz, 1 H), 7.43 (dd,J=8 & 1 Hz, 1 H), 8.46 (dd, J=5 & 1 Hz, 1 H)

IR (Nujol): 1600, 1530, 1395, 1375, 1245 cm⁻¹

Example 701-Methylamino-1-[N-methyl-N-(4-thiazolyl)methyl]amino-2-nitroethylene(Compound 88) ##STR82##

The steps (1), (2) and (3) of Example 13 were repeated except thatN-methyl-N-(4-thiazolyl)methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-(4-thiazolylmethyl)thiourea (oil, crystallizedon standing in a refrigerator)

(provided that the product was purified by silica gel columnchromatography)

NMR (CDCl₃) δ: 3.15 (d, J=5 Hz, MeNH), 3.30 (s, MeNCH₂), 4.98 (s, CH₂),6.87 (br, NH), 7.38 (d, J=2 Hz, 1 H), 8.81 (d, J=2 Hz, 1 H)

(2) S-Methyl-N-methyl-N'-methyl-N'-(4-thiazolylmethyl)isothiourea (oil)

NMR (CDCl₃) δ: 2.31 (s, MeS), 2.91 (s, MeNCH₂), 3.27 (s, MeN=), 4.79 (s,CH₂), 7.17 (m, 1 H), 8.80 ((, J=2 Hz, 1 H)

(3) Title compound (yellow crystals)

(provided that the reaction was conducted for 4.5 hours)

m.p.: 155-156° C.

NMR (DMSO-d₆) δ: 2.89 (s, MeNCH₂), 2.98 (d, J=5 Hz, MeNH), 4.60 (s,CH₂), 6.55 (s, =CHNO₂), 7.70 (d, J=2 Hz, 1 H), 8.95 (br q, J=5 Hz, 1 H),9.12 (d, J=2 Hz, 1 H)

IR (Nujol): 1580, 1530, 1290, 1270, 1255 cm⁻¹

Example 71 1,1-bis(6-Chloro-3-pyridylmethyl)amino-2-nitroethylene(Compound 89) ##STR83##

(1) A mixture of 7.0 g (0.042 mole) of1,1-bis(methylthio)-2-nitroethylene, 4.5 g of N,O-dimethylhydroxyaminehydrochloride and 80 ml of EtOH was refluxed and 6.4 ml of Et₃ N wasadded dropwise over 1 hour. After completion of dropwise addition, themixture was further refluxed for 2 hours. The reaction mixture was thenconcentrated and the resulting crystals were filtered off. The filtratewas concentratd and the residue was subjected to silica gel columnchromatography using EtOH-CHCl₃ (1:30) as the eluent. The procedure gave1.0 g of 1-(N-methyl-N-meythoxy)amino-1-methylthio-2-nitroethylene as ayellow oil.

NMR (CDCl₃) δ: 2.43 (3 H, s), 3.26 (3 H, s), 3.68 (3 H, s), 7.16 (1H,s)

(2) A mixture of 0.8 g (0.0045 mole) of1-(N-methyl-N-methoxy)amino-1-methylthio-2-nitroethylene, 0.7 g of(6-chloro-3-pyridylmethyl)amine and 30 ml of EtOH was refluxed for 4hours. The resulting crystals were collected by filtration and dried togive 150 mg of the title compound as crystals.

m.p.: 238-240° C. (decompn.)

NMR (DMSO-d₆) δ: 4.53 (4 H, d, J=5.7 Hz), 6.51 (1 H, s), 7.50 (2 H, d,J=8.7 Hz), 7.76 (2 H, dd, J=8.7 & 2.4 Hz), 8.37 (2 H, d, J=2.4 Hz),9.7-10.8 (2 H, br)

IR (Nujol): 3240, 1620, 1575, 1460, 1395, 1220 cm⁻¹

Example 721-[N-(6-Chloro-3-pyridyl)-N-ethyl]amino-1-methylamino-2-nitroethylene(Compound 90) ##STR84##

(1) In 30 ml of toluene was dissolved 2.4 g (0.015 mole) of2-chloro-5-ethylaminopyridine, followed by addition of 3.4 g of methylisocyanate. The mixture was refluxed for 15 hours. After cooling, theresulting crystals were collected by filtration, washed with a smallamount of Et₂ O and dried. The procedure gave 3.0 g ofN-(6-chloro-3-pyridyl)-N-ethyl-N'-methylurea as pale yellow crystals.

m.p.: 135-136° C.

NMR (CDCl₃) δ: 1.11 (t, J=7 Hz, 3 H), 2.75 (d, J=5 Hz, 3 H), 3.72 (q,J=7 Hz, 2 H), 4.36 (br, 1 H), 7.40 (d, J=8 Hz, 1 H), 7.59 (dd, J=8 & 3Hz, 1 H), 8.28 (d, J=3 Hz, 1 H)

(2) In 30 ml of CH₃ CN was dissolved 1.5 g (0.007 mole) ofN-(6-chloro-3-pyridyl)-N-ethyl-N'-methylurea, followed by addition of3.1 g of phosphorus pentasulfide. The mixture was refluxed for 3 hours.The insoluble matter was then filtered off and the filtrate wasconcentrated and diluted with 20 ml of water. The mixture wasneutralized with NaHCO₃ and extracted with CH₂ Cl₂ (50 ml×3) and theextract was dried over MgSO₄. After concentration, the residue waspurified by silica gel column chromatography to recover 0.52 g ofN-(6-chloro-3-pyridyl)-N-ethyl-N'-methylthiourea as pale yellowcrystals.

m.p.: 110-111° C.

NMR (CDCl₃) δ: 1.20 (t, J=7 Hz, 3 H), 3.06 (d, J=5 Hz, 3 H), 4.22 (q,J=7 Hz, 2 H), 5.42 (br, 1 H), 7.40-7.70 (m, 2 H), 8.28 (d, J=3 Hz, 1 H)

(3) The reaction procedure of Example 59 (2) was repeated except thatN-(6-chloro-3-pyridyl)-N-ethyl-N'-methylthiourea was used in lieu ofN-(6-chloro-3-pyridyl)-N-methyl-N'-methylthiourea to giveS-methyl-N-(6-chloro-3-pyridyl)-N-ethyl-N'-methylisothiourea as a paleyellow oil.

NMR (CDCl₃) δ: 1.06-1.43 (m, 3 H), 2.02 & 2.39 (each s, 3 H), 3.03 &3.30 (each s, 3 H), 3.46-3.93 (m, 2 H), 6.90-7.53 (m, 2 H), 7.88 & 8.20(each d, J=3 Hz, 1 H)

(4) The reaction procedure of Example 59 (3) was repeated except thatS-methyl-N-(6-chloro-3-pyridyl)-N-ethyl-N'-methylisothiourea was used inlieu of S-methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-methylisothiourea togive the title compound as pale yellow crystals.

m.p.: 95-96° C.

NMR (CDCl₃) δ: 1.23 (t, J=7 Hz, 3 H), 2.71 (d, J=5 Hz, 3 H), 3.75 (q,J=7 Hz, 2 H), 6.67 (s, 1 H), 7.26-7.53 (m, 2 H), 8.20 (d, J=3 Hz, 1 H),10.05 (br, 1 H)

IR (Nujol): 3100, 1600, 1505, 1320, 1220, 1170, 1120, 1020 cm⁻¹

Example 731-[N-(6-Chloro-3-pyridyl)-N-n-propyl]amino-1-methylamino-2-nitroethylene(Compound 91) ##STR85##

The steps (1), (2), (3) and (4) of Example 72 were repeated except that2-chloro-5-n-propylaminopyridine was used in lieu of2-chloro-5-ethylaminopyridine to obtain the following compounds in therespective steps.

(1) N-(6-Chloro-3-pyridyl)-N-n-propyl-N'-methylurea (pale yellowcrystals)

m.p.: 84-85° C.

NMR (CDCl₃) δ: 0.87 (t, J=7 Hz, 3 H), 1.26-1.80 (m, 2 H), 2.75 (d, J=5Hz, 3 H), 3.62 (t, J=7 Hz, 2 H), 4.40 (br, 1 H), 7.38 (d, J=8 Hz, 1 H),7.66 (dd, J=8 & 3 Hz, 1 H), 8.28 (d, J=3 Hz, 1 H)

(2) N-(6-Chloro-3-pyridyl)-N-n-propyl-N'-methylthiourea (pale yellowcrystals)

m.p.: 145-146° C.

NMR (CDCl₃) δ: 0.90 (t, J=7 Hz, 3 H), 1.40-1.93 (m, 2 H), 3.07 (d, J=5Hz, 3 H), 4.12 (t, J=7 Hz, 2 H), 5.33 (br, 1 H), 7.40-7.70 (m, 2 H),8.30 (d, J=3 Hz, 1H)

(3) S-Methyl-N-(6-chloro-3-pyridyl)-N-n-propyl-N'-methylisothiourea(pale yellow oil)

NMR (CDCl₃) δ: 0.80-1.10 (m, 3 H), 1.40-1.90 (m, 2 H), 2.01 & 2.37 (eachs, 3 H), 3.00 & 3.28 (each s, 3 H), 3.36-3.83 (m, 2 H), 6.90-7.53 (m, 2H), 7.86 & 8.18 (each d, J=3 Hz, 1H)

(4) Title compound (pale yellow crystals)

m.p.: 94-95°-C.

NMR (CDCl₃) δ: 0.95 (t, J=7 Hz, 3 H), 1.43-1.93 (m, 2 H), 2.68 (d, J=5Hz, 3 H), 3.61 (t, J=7 Hz, 2 H), 6.69 (s, 1 H), 7.26-7.50 (m, 2 H), 8.21(d, J=3 Hz, 1 H), 10.06 (br, 1 H)

IR (Nujol): 3100, 1590, 1520, 1360, 1310, 1225, 1120, 1020 cm⁻¹

Example 741-[N-n-Butyl-N-(6-chloro-3-pyridyl)]amino-1-methylamino-2-nitroethylene(Compound 92) ##STR86##

The steps (1), (2), (3) and (4) of Example 72 were repeated except that2-chloro-5-n-butylaminopyridine was used in lies of2-chloro-5-ethylaminopyridine to give the following compounds in therespective steps.

(1) N-n-Butyl-N-(6-chloro-3-pyridyl)-N'-methylurea (pale yellow oil)

NMR (CDCl₃) δ: 0.86-1.06 (m, 3 H), 1.10-1.73 (m, 4 H), 2.75 (d, J=5 Hz,3 H), 3.66 (t, J=7 Hz, 2 H), 4.30 (d, J=5 Hz, 1 H), 7.40 (d, J=8 Hz, 1H), 7.60 (dd, J=8 & 3 Hz, 1 H), 8.29 (d, J=3 Hz, 1 H)

(2) N-n-Butyl-N-(6-chloro-3-pyridyl)-N'-methylthiourea (pale yellowcrystals)

(provided that the reaction was conducted in toluene for 1 hour)

m.p.: 129-130° C.

NMR (CDCl₃) δ: 0.90 (t, J=7 Hz, 3 H), 1.10-1.83 (m, 4 H), 3.07 (d, J=5Hz, 3 H), 4.15 (t, J=7 Hz, 2 H), 5.52 (d, J=5 Hz, 1 H), 7.36-7.70 (m, 2H), 8.25 (d, J=3 Hz, 1 H)

(3) S-Methyl-N-n-butyl-N-(6-chloro-3-pyridyl)-N'-methylisothiourea (paleyellow oil)

NMR (CDCl₃) δ: 0.80-1.06 (m, 3 H), 1.10-1.80 (m, 4 H), 2.00 & 2.36 (eachs, 3 H), 3.00 & 3.27 (each s, 3 H), 3.42-3.82 (m, 2 H), 6.90-7.50 (m, 2H), 7.86 & 8.18 (each d, J=3 Hz, 1 H)

(4) Title compound (pale yellow crystals)

m.p.: 87-88° C.

NMR (CDCl₃) δ: 0.93 (t, J=7 Hz, 3 H), 1.10-1.85 (m, 4 H), 2.68 (d, J=5Hz, 3 H), 3.65 (t, J=7 Hz, 2 H), 6.69 (s, 1 H), 7.26-7.52 (m, 2 H), 8.21(d, J=3 Hz, 1 H), 10.05 (br, 1 H)

IR (Nujol): 3100, 1590, 1520, 1360, 1310, 1250, 1120, 1020 cm⁻¹

Example 751-[N-(6-Chloro-3-pyridyl)-N-ethyl]amino-1-ethylamino-2-nitroethylene(Compound 93) ##STR87##

The steps (1), (2) and (3) of Example 59 were repeated except that2-chloro-5-ethylaminopyridine and ethyl isothiocyanate were used in lieuof 2-chloro-5-methylaminopyridine and methyl isothiocyanate,respectively, to give the following compounds in the respective steps.

(1) N-(6-Chloro-3-pyridyl)-N-ethyl-N'-ethylthiourea (pale red crystals)

(provided that the reaction was conducted in toluene for 66 hours)

m.p.: 84-86° C.

NMR (CDCl₃) δ: 1.11 (3 H, t, J=7.1 Hz), 1.19 (3 H, t, J=7.2 Hz), 3.63 (2H, dq, J=5.6 & 7.1 Hz), 4.21 (2 H, q, J=7.1 Hz), 4.9-5.5 (1 H, m, NH),7.4-7.7 (2 H, m), 8.29 (1 H, d, J=2.4 Hz)

(2) S-Methyl-N-(6-chloro-3-pyridyl)-N-ethyl-N'-ethylisothiourea (oil)

NMR (CDCl₃) δ: 1.0-1.6 (6 H, m), 2.00 & 2.38 (3 H, each s,), 3.1-4.5 (4H, m), 6.8-7.6 (2 H, m), 7.7-8.5 (1 H, m)

(3) Title compound (pale yellow crystals)

m.p: 105° C.

NMR (CDCl₃) δ: 1.0-1.5 (6 H, m), 2.94 (2 H, dq, J=5.2 & 7.0 Hz), 3.74 (2H, q, J=7.1 Hz), 6.65 (1 H, s), 7.2-7.6 (2 H, m), 8.1-8.4 (1 H, m),9.6-10.2 (1 H, m, NH)

IR (Nujol): 3110, 1600 cm⁻¹

Example 761-Methylamino-1-[N-methyl-N-(5-trifluoromethyl-3-pyridyl)]amino-2-nitroethylene(Compound 94) ##STR88##

(1) The reaction procedure of Example 59 (1) was repeated except that3-methylamino-5-trifluoromethylpyridine was used in lieu of2-chloro-5-methylaminopyridine (refluxed in toluene for 61.5 hours) togive N-methyl-N'-methyl-N'-(5-trifluoromethyl-3-pyridyl)thiourea as palebrown crystals.

m.p.: 86-90° C.

NMR (CDCl₃) δ: 3.12 (3 H, d, J=4.2 Hz), 3.67 (3 H, s), 5.3-5.8 (1 H, m,NH), 7.8-8.0 (1 H, m), 8.77 (1 H, d, J=2.4 Hz), 8.88 (1 H, br s)

(2) A mixture of 0.2 g (0.0008 mole) ofN-methyl-N'-methyl-N'-(5-trifluoromethyl-3-pyridyl)thiourea, 0.3 g ofmethyl iodide and 10 ml of CH₃ CN was stirred at room temperature for13.5 hours. Then, 0.3 g of methyl iodide was further added and themixture was stirred for 18.5 hours. The reaction mixture wasconcentrated and the residue was diluted with 50 ml of AcOEt and aqueoussodium hydrogen carbonate solution. After shaking, the mixture wassubjected to phase separation. The AcOEt layer was washed with aqueoussodium chloride solution, dried over MgSO₄ and concentrated. Theprocedure gave 0.2 g of crudeS-methyl-N-methyl-N'-methyl-N'-(5-trifluoromethyl-3-pyridyl)isothioureaas oil.

(3) A mixture of 0.2 g of crudeS-methyl-N-metyl-N'-methyl-N'-(5-trifluoromethyl-3-pyridyl)isothioureaand 10 ml of CH₃ NO₂ was refluxed for 36.5 hours. The reaction mixturewas concentrated and the residue was subjected to silica gel columnchromatography using hexane-acetone (2:1) as the eluent. The proceduregave 18 mg of the title compound as yellow-brown crystals.

m.p: 114-115° C.

NMR (CDCl₃) δ: 2.81 (3 H, d, J=5.1 Hz), 3.36 (3 H, s), 6.63 (1 H, s),7.5-7.7 (1 H, m), 8.5-8.7 (2 H, m), 9.6-10.1 (1 H, m, NH)

Example 771-[N-(6-Chloro-3-pyridyl)-N-methyl]amino-1-n-propylamino-2-nitroethylene(Compound 95) ##STR89##

The steps (1), (2) and (3) of Example 59 were repeated except thatn-propyl isothiocyanate was used in lieu of methyl isothiocyanate togive the following compounds in the respective steps.

(1) N-(6-Chloro-3-pyridyl)-N-methyl-N'-n-propylthiourea (yellow oil)

(provided that the reaction mixture was refluxed in toluene for 121hours and the product was purified by silica gel column chromatography)

NMR (CDCl₃) δ: 0.86 (3 H, t, J=6.6 Hz), 1.2-1.8 (2 H, m), 3.63 (3 H, s),3.4-3.9 (2 H, m), 5.1-5.7 (1 H, br), 7.45 (1 H, d, J=8.4 Hz), 7.61 (1 H,dd, J=8.4 & 2.7 Hz), 8.34 (1 H, d, J=2.7 Hz)

(2) S-Methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-n-propylisothiourea(yellow oil)

NMR (CDCl₃) δ: [major component . . . 74%]0.96 (3 H, t, J=7.5 Hz),1.3-1.9 (2 H, m), 2.03 (3 H, s), 3.28 (3 H, s), 3.47 (2 H, t, J=7.5 Hz),7.25 (1 H, d, J=8.4 Hz), 7.45 (1 H, dd, J=8.4 & 2.7 Hz), 8.23 (1 H, d,J=2.7 Hz) [minor component (isomer) . . . 26%] 2.38 (3 H, s), 3.14 (3 H,s), 3.0-3.4 (2 H, m), 6.9-7.4 (2 H, m)

(4) Title compound (oil)

NMR (CDCl₃) δ: 0.93 (3 H, t, J=7.2 Hz), 1.59 (2 H, tq, J=7.2 & 7.2 Hz),2.95 (2 H, dt, J=6.0 & 7.2 Hz), 3.30 (3 H, s), 6.60 (1 H, s), 7.2-7.6 (2H, m), 8.23 (1 H, d, J=3.0 Hz), 9.6-10.1 (1 H, br)

IR (neat): 3110, 2950, 1595, 1450, 1360 cm⁻¹

Example 78 1-(6-Chloro-3-pyridyl)amino-1-methylamino-2-nitroethylene(Compound 96) ##STR90##

(1) A mixture of 3.9 g (0.0303 mole) of 5-amino-2-chloropyridine, 5.0 gof 1,1-bis(methylthio)-2-nitroethylene and 80 ml of ethylbenzene washeated at 130° C. for 2 hours. The ethylbenzene was distilled off underreduced pressure and the crystalline residue was washed with AcOEt andsubjected to silica gel column chromatography using EtOH-CHCl₃ (1:30) asthe eluent to recover crude crystals. These crystals were recrystallizedfrom AcOEt, washed with ether and dried. The procedure gave 0.5 g of1-(6-chloro-3-pyridyl)amino-1-methylthio-2-nitroethylene as pale yellowcrystals.

m.p.: 169-171° C.

MNR (CDCl₃) δ: 2.42 (3 H, s), 6.70 (1 H, s), 7.41 (1 H, d, J=9.0 Hz),7.65 (1 H, dd, J=9.0 & 2.4 Hz), 8.41 (1 H, d, J=2.4 Hz), 11.3-11.8 (1 H,br)

(2) In 25 ml of EtOH was dissolved 0.42 g (0.00171 mole) of1-(6-chloro-3-pyridyl)amino-1-methylthio-2-nitroethylene, followed byaddition of 0.2 g of a 40% solution of methylamine in methanol. Themixture was refluxed for 1.5 hours. The solvent was distilled off andthe crystalline residue was washed with AcOEt and dried to recover 0.33g of the title compound as white crystals.

m.p.: 185° C. (decompn.)

NMR (DMSO-d₆) δ: 2.94 (3 H, d, J=5.4 Hz), 6.24 (1 H, s), 7.57 (1 H, d,J=9.0 Hz), 7.80 (1 H, dd, J=9.0 & 2.7 Hz), 8.34 (1 H, d, J=2.7 Hz),8.8-9.7 (1 H, br), 9.2-10.3 (1 H, br)

IR (Nujol): 3150, 1635, 1210 cm⁻¹

Example 791-Methylamino-1-[N-methyl-N-(6-methyl-3-pyridylmethyl)]amino-2-nitroethylene(Compound 97) ##STR91##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-methyl-N-(6-methyl-3-pyridylmethyl)amine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-Methyl-N'-methyl-N'-(6-methyl-3-pyridylmethyl)thiourea (pale pinkcrystals)

m.p.: 120-122° C.

NMR (CDCl₃) δ: 2.53 (s, pyridine-Me), 3.06 (s, MeNCH₂), 3.16 (d, J=5 Hz,MeNH), 5.16 (s, CH₂), 6.14 (br q, J=5 Hz, NH), 7.15 (d, J=8 Hz, 1 H),7.64 (dd, J=8 & 2 Hz, 1H), 8.40 (d, J=2 Hz, 1H)

(2) S-Methyl-N-methyl-N'-methyl-N'-(6-methyl-3-pyridylmethyl)isothiourea(oil)

NMR (CDCl₃) δ: 2.31 (s, MeS), 2.53 (s, pyridine-Me), 2.81 (s, MeNCH₂),3.25 (s, NeN=), 4.53 (S, CH₂), 7.11 (d, J=8 Hz, 1 H), 7.48 (dd, J=8 & 2Hz, 1 H), 8.40 (d, J=2 Hz, 1 H)

(3) Title compound (yellow crystals)

m.p.: 102-103° C.

NMR (CDCl₃) δ: 2.57 (s, pyridine-Me), 2.80 (s, MeNCH₂), 3.08 (d, J=5 Hz,MeNH), 4.39 (s, CH₂), 6.54 (s, =CHNO₂), 7.21 (c, J=8 Hz, 1 H), 7.48 (dd,J=8 & 2 Hz, 1 H), 9.78 (br, NH)

IR (Nujol): 1600, 1550, 1310, 1250, 1090 cm⁻¹

Example 801-[N-(6-Fluoro-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 98) ##STR92##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-(6-fluoro-3-pyridylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(6-Fluoro-3-pyridylmethyl)-N-methyl-N'-methylthiourea (colorlessoil)

(provided that the reaction was conducted in CHCl₃ overnight and theproduct was purified by silica gel column chromatography)

NMR (CDCl₃) δ: 3.04 (3 H, s, MeNCH₂), 3.18 (3 H, d, MeNH), 5.22 (2 H, s,CH₂), 6.88 (1 H, br, NH), 7.93 (1 H, dd, J=8.4 & 2.7 Hz), 8.54 (1 H,ddd, J=8.4, 2.4 & 8.4 Hz), 8.15 (1 H, d, J=2.4 Hz)

(2) S-Methyl-N-(6-fluoro-3-pyridylmethyl)-N-methyl-N'-methylisothiourea(oil)

NMR (CDCl₃) δ: 2.30 (3 H, s, MeS), 2.83 (3 H, s, MeNCH₂), 3.24 (3 H, s,MeN=), 4.53 (2 H, s, CH₂), 6.90 (1 H, dd), 7.72 (1 H, ddd), 8.12 (1 H,d)

(3) Title compound (pale brown crystals)

m.p.: 100-100.5° C.

NMR (CDCl₃) δ: 2.78 (3 H, s, MeNCH₂), 3.07 (3 H, d, MeNH), 4.39 (2 H, s,CH₂), 6.52 (1 H, s, =CHNO₂), 7.00 (1 H, dd, J=8.4 & 2.7 Hz), 7.71 (1 H,ddd, J=8.4, 2.4 & 8.4 Hz), 8.14 (1 H, d, J=2.4 Hz), 9.74 (1 H, br, NH)

IR (Nujol): 1593, 1548, 1477, 1465, 1437, 1405, 1390, 1310, 1250, 1230,1165, 1083, 1029 cm⁻¹

Example 811-[N-Ethyl-N-(6-fluoro-3-pyridylmethyl)]amino-1-methylamino-2-nitroethylene(Compound 99) ##STR93##

(1) In 30 ml CH₃ CN was dissolved 4.2 g of 70% aqueous ethylaminesolution and 3.0 g (0.016 mole in terms of pure product) of crude(6-fluoro-3-pyridyl)methyl bromide was added bropwise thereto underice-cooling. The mixture was allowed to stand at room temperatureovernight and the CH₃ CN was distilled off. The residue was diluted with20 ml of water and-extracted with CHCl₃ (30 ml). The extract was driedover MgSO₄ and the CHCl₃ was distilled off to recover 1.38 g of red oil.This oil was dissolved in 30 ml of CHCl₃, followed by addition of 0.68 gof methyl isothiocyanate. The mixture was stirred at room temperaturefor 3 hours. The reaction mixture was treated with activated carbon andconcentrated and the residue was subjected to silica gel columnchromatography using AcOEt-hexane (3.5:1) as the eluent. The proceduregave 0.6 g of N-ethyl-N-(6-fluoro-3-pyridylmethyl)-N'-methylthiourea ascolorless crystals.

m.p.: 123-124° C.

NMR (CDCl₃) δ: 1.18 (3 H, t, CH₂ CH₃), 3.19 (3 H, d, MeNH), 3.48 (2 H,q, CH₂ CH₃), 5.15 (2 H, s, pyridine-CH₂), 5.70 (1 H, br, NH), 6.92 (1 H,dd, J=8.4 & 2.7 Hz), 7.96 (1 H, ddd, J=8.4, 2.4 & 8.4 Hz), 8.15 (1 H, d,J=2.4 Hz)

(2) The reaction procedure of Example 13 (2) was repeated except thatN-ethyl-N-(6-fluoro-3-pyridylmethyl)-N'-methylthiourea was used in lieuof N-methyl-N'-ethyl-N'-(3-pyridylmethyl)thiourea to giveS-methyl-N-ethyl-N-(6-fluoro-3-pyridylmethyl)-N'-methylisothiourea as apale brown oil.

NMR (CDCl₃) δ: 1.08 (3 H, t, CH₂ CH₃)₁ 2.29 (3 H, s, MeS), 3.22 (3 H, s,MeN=), 3.36 (2 H, q, CH₂ CH₃), 4.49 (2 H, s, CH₂), 6.87 (1 H, dd), 7.71(1 H, ddd), 8.11 (1 H, d)

(3) The reaction procedure of Example 13 (3) was repeated except thatS-methyl-N-ethyl-N-(6-fluoro-3-pyridylmethyl)-N'-methylisothiourea wasused in lieu ofS-methyl-N-methyl-N'-ethyl-N'-(3-pyridylmethyl)isothiorea to give thetitle compound as oil.

NMR (CDCl₃) δ: 1.19 (3 H, t, CH₂ CH₃), 3.08 (3 H, d, MeNH), 3.16 (2 H,q, CH₂ CH₃), 4.37 (2 H, s, CH₂), 6.54 (1 H, s, =CHNO₂), 6.98 (1 H, dd,J=8.4 & 2.7 Hz), 7.80 (1 H, ddd, J=8.4, 2.4 & 8.4 Hz), 8.15 (1 H, d,J=2.4 Hz)

IR (neat): 3230, 1593, 1510, 1480, 1395, 1335, 1235, 1120, 1020 cm⁻¹

Example 821-[N-(6-Bromo-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 100) ##STR94##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-(6-bromo-3-pyridylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(6-Bromo-3-pyridylmethyl)-N-methyl-N'-methylthiourea (whitecrystals)

(provided that the product was purified by silica gel columnchromatography)

m.p.: 107-108° C.

NMR (CDCl₃) δ: 3.04 (3 H, s), 3.18 (3 H, d, J=4.8 Hz), 5.19 (2 H, s),5.6-6.1 (1 H, br), 7.46 (1 H, d, J=8.4 Hz), 7.66 (1 H, dd, J=8.4 & 2.4Hz), 8.29 (1 H, d, J=2.4 Hz)

(2) S-Methyl-N-(6-bromo-3-pyridylmethyl)-N-methyl-N'-methylisothiourea(colorless oil)

NMR (CDCl₃) δ: 2.29 (3 H, s), 2.84 (3 H, s), 3.23 (3 H, s), 4.50 (2 H,s), 7.3-7.6 (2 H, m), 8.29 (1 H, d, J=2.4 Hz)

(3) Title compound (pale brown crystals)

m.p.: 130-131° C.

NMR (CDCl₃) δ: 2.80 (3 H, s), 3.06 (3 H, d, J=5.4 Hz), 4.36 (2 H, s),6.51 (1 H, s), 7.35-7.70 (2 H, m), 8.2-8.4 (1 H, m), 9.4-10.0 (1 H, br)

IR (Nujol): 3200, 1580, 1390, 1280, 1245, 1205, 1075 cm⁻¹

Example 831-[N-(6-Bromo-3-pyridylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylene(Compound 101) ##STR95##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-(6-bromo-3-pyridylmethyl)-N-ethylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(6-Bromo-3-pyridylmethly)-N-ethyl-N'-methylthiourea (pale yellowcrystals)

m.p.: 130-131° C.

NMR (CDCl₃) δ: 1.18 (3 H, t, J=7.8 Hz), 3.18 (3 H, d, J=5.0 Hz), 3.46 (2H, q, J=7.8 Hz), 5.12 (2 H, s), 5.5-6.0 (1 H, br), 7.46 (1 H, d, J=8.7Hz), 7.69 (1 H, dd, J=8.7 & 2.1 Hz), 8.29 (1 H, d, J=2.1 Hz)

(2) S-Methyl-N-(6-bromo-3-pyridylmethyl)-N-ethyl-N'-methylisothiourea(yellow oil)

NMR (CDCl₃) δ: 1.08 (3 H, t, J=6.3 Hz), 2.29 (3 H, s), 3.21 (3 H, s),3.36 (2 H, q, J=6.3 Hz), 4.46 (2 H, s), 7.3-7.6 (2 H, m), 8.28 (1 H, brs)

(3) Title compound

(provided that the reaction was conducted for 38 hours)

m.p.: 79-80° C.

NMR (CDCl₃) δ: 1.18 (3 H, t, J=6.3 Hz), 3.06 (3 H, d, J=5.7 Hz), 3.16 (2H, q, J=6.3 Hz), 4.34 (2 H, s), 6.53 (1 H, s), 7.3-7.7 (2 H, m), 8.30 (1H, br s), 9.5-10.1 (1 H, br q, J=5.7 Hz)

IR (Nujol): 3200, 1580, 1240, 1080 cm⁻¹

Example 841-[N-(2-Chloro-5-thiazolylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 102) ##STR96##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-(2-chloro-5-thiazolylmethyl)-N-methylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(2-Chloro-5-thiazolylmethyl)-N-methyl-N'-methylthiourea(white--pale brown crystals)

(provided that a silica gel column was used for purification)

m.p.: 129-131° C.

NMR (CDCl₃) δ: 3.06 (s, MeNCH₂), 3,16 (d, J=4 Hz, MeNH), 5.21 (s, CH₂),5.83 (br, NH), 7.48 (s, thiazole-H)

(2)S-Methyl-N-(2-chloro-5-thiazolylmethyl)-N-methyl-N'-methylisothiourea(yellow oil)

NMR (CDCl₃) δ: 2.30 (s, MeS), 2.90 (s, MeNCH₂), 3.24 (s, MeN=), 4.50 (s,CH₂), 7.39 (s, thiazole-H)

(3) Title compound (pale brown crystals)

m.p.: 131-133° C.

NMR (CDCl₃) δ: 2.84 (s, MeNCH₂), 3.09 (d, J=5 Hz, MeN=), 4.49 (s, CH₂),6.51 (s, =CHNO₂), 7.50 (s, thiazole-H), 9.66 (br, NH)

IR (Nujol): 1585, 1395, 1260, 1070, 1050, 1025 cm⁻¹

Example 851-[N-(2-Chloro-5-thiazolylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylene(Compound 103) ##STR97##

The steps (1), (2) and (3) of Example 13 were repeated except that crudeN-(2-chloro-5-thiazolylmethyl)-N-ethylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine to give the following compounds in therespective steps.

(1) N-(2-Chloro-5-thiazolylmenthyl)-N-ethyl-N'-methylthiourea (whitecrystals)

m.p.: 116-118° C.

NMR (CDCl₃) δ: 1.19 (t, J=7 Hz, CH₂ CH₃), 3.16 (d, J=4 Hz, MeNH), 3,44(q, J=7 Hz, CH₂ CH₃), 5.15 (s, thiazole-CH₂), 5.79 (br, NH), 7.47(thiazole-H)

(2) S-Methyl-N-(2-chloro-5-thiazolylmethyl)-N-ethyl-N'-methylisothiourea(oil)

NMR (CDCl₃) δ: 1.11 (t, J=7 Hz, CH₂ CH₃), 2.28 (s, MeS), 3.26 (s, MeN),3.40 (q, J=7 Hz, CH₂ CH₃), 4.50 (s, thiazole-CH₂), 7.39 (s, thiazole-H)

(3) Title compound (pale brown crystals)

(provided that the reaction was conducted for 24 hours).

m.p.: 91-92° C. (This product was recrystallized from AcOEt-hexane togive product indicating m.p. 110-112° C.)

NMR (CDCl₃) δ: 1.18 (t, J=7 Hz, CH₂ CH₃), 3.07 (d, J=5 Hz, MeNH), 3.17(q, J=7 Hz, CH₂ CH₃), 4.46 (s, thiazole-CH₂), 6.52 (s, =CHNO₂), 7.47 (s,thiazole-H), 9.75 (br, NH)

IR (Nujol): 1585, 1450, 1405, 13600, 1255, 1225, 1050 cm⁻¹

Example 861-(2-Chloro-5-thiazolylmethyl)amino-1-dimethylamino-2-nitroethylene(Compound 104) and1,1-bis(2-chloro-5-thiazolylmethyl)amino-2-nitroethylene (Compound 105)##STR98##

A mixture of 0.60 g (0.0037 mole) of1-dimethylamino-1-methylthio-2-nitroethylene, 0.55 g of2-chloro-5-thiazolymethylanine and 30 ml of EtOH was refluxed for 1.5hours. After cooling, the resulting crystals of1-N-(2-chloro-5-thiazolylmethyl)amino-1-methylthio-2-nitroethylene (0.20g) were filtered off and the filtrate was concentrated and subjected tosilica gel column chromatography using EtOH-CHCl₃ (1:10) as the eluent.The procedure gave 0.07 g of the title compound (Compound 104) and 0.034g of the title compound (Compound 105).(1-(2-Chloro-5-thiazolylmethyl)amino-1-methylthio-2-nitroethylene)

m.p.: 150-152° C.

NMR (CDCl₃) δ: 2.49 (3 H, s), 4.78 (2 H, d, J=6.0 Hz), 6.58 (1 H, s),7.52 (1 H, s), 10.3-10.8 (1 H, br)

(Compound 104)

m.p.: 101-102° C.

NMR (CDCl₃) δ: 2.97 (6 H, s), 4.58 (2 H, d, J=6.3 Hz), 6.51 (1 H, s),7.50 (1 H, s), 9.3-9.8 (1 H, br)

IR (Nujol): 3100, 1585, 1380, 1255, 1030 cm⁻¹

(Compound 105)

m.p.: 211° C. (decompn.)

NMR (DMSO-d₆) δ: 4.5-4.8 (4 H, m), 6.63 (1 H, s), 7.63 (2 H, s)

IR (Nujol): 3120, 1610, 1210, 1040 cm⁻¹

Example 871-(2-Chloro-5-thiazolylmethyl)amino-1-methylamino-2-nitroethylene(Compound 106) ##STR99##

A mixture of 0.19 g (0.00072 mole) of the1-N-(2-chloro-5-thiazolylmethyl)amino-1-methylthio-2-nitroethyleneprepared in Example 86 and 25 ml of EtOH was heated at 70° C. Then 0.1 gof a 40% aqueous solution of methylamine was added and the mixture wasstirred at 70° C. for 0.5 hour. The EtOH was distilled off, and afteraddition of AcOEt, the crystalline residue was filtered and dried. Theprocedure gave 0.12 g of the title compound as white crystals.

m.p.: 181° C. (decompn.)

NMR (DMSO-d₆) δ: 2.83 (3 H, d, J=5.1 Hz), 4.63 (2 H, d, J=6.3 Hz), 6.57(1 H, s), 7.66 (1 H, s), 7.3-8.1 (1 H, br), 9.6-10.4 (1 H, br)

IR (Nujol): 3140, 1620, 1415, 1210 cm⁻¹

Example 881-(6-Chloro-3-pyridylmethyl)amino-1-dimethylamino-2-nitroethylene(Compound 46) ##STR100##

(1) A mixture of 4.32 g (0.0303 mole) of 6-chloro-3-pyridylmethylamine,20 ml of water and 1.78 g of sodium hydroxide was stirred at roomtemperature and 2.37 ml of carbon disulfide was added dropwise. Aftercompletion of dropwise addition, the mixture was further stirred at 50°C. for 1 hour. After cooling with ice-water, 3.49 nil of ethylchlorocarbonate was added dropwise at about 5° C. After completion ofdropwise addition, the mixture was stirred at 50° C. for 1 hour. Aftercooling, the reaction mixture was saturated with sodium chloride andextracted with Et₂ O (50 ml×3), and the extract aas dried over MgSO₄.Then, the Et₂ O was distilled off to recover 5.38 g of crude(6-chloro-3-pyridyl)methyl isothiocyanate as oil.

NMR (CDCl₃) δ: 4.77 (s, CH₂), 7.39 (d, J=8 Hz, 1 H), 7.70 (dd, J=8 & 2Hz, 1 H), 8.36 (d, J=2 Hz, 1 H)

(2) A mixture of 5.16 g or a 50% aqueous solution of dimethylamine and30 ml of CH₃ CN was stirred under cooling with ice-water. Then, asolution of 5.29 g (0.0287 mole in terms of pure product) of crude(6-chloro-3-pyridyl)methyl isothiocyanate in 30 ml of CH₃ CN was addeddropwise thereto. After completion of dropwise addition, the mixture wasstirred at room temperature for 15 minutes. The CH₃ CN was distilled offand the residue was diluted with aqueous sodium chloride solution andextracted with CH₂ Cl₂ (50 ml×3). The extract was dried over MgSO₄ andthe CH₂ Cl₂ was distilled off, whereupon crystals were obtained. Afteraddition of Et₂ O, the crystals were collected by filtration, dried andrecrystallized from AcOEt. The procedure gave 3.82 g ofN-(6-chloro-3-pyridylmethyl)-N'-dimethylthiourea as yellow crystals.

m.p.: 139-141° C.

NMR (CDCl₃) δ: 3.27 (s, Me₂ N), 4.88 (d, J=5 Hz, CH₂), 6.17 (br t, J=5Hz, NH), 7.27 (d, J=8 Hz, 1 H), 7.76 (dd, J=8 & 2 Hz, 1 H), 8.25 (d, J=2Hz, 1 H)

(3) To 3.00 g (0.013 mole) ofN-(6-chloro-3-pyridylmethyl)-N'-dimethylthiourea was added 32 ml of dryTHF, followed by addition of 0.52 g of 60% sodium hydride. The mixturewas stirred at 50° C. for 15 minutes. After cooling pith ice-water,0.814 ml of methyl iodide was added dropwise and the mixture was stirredat room temperature for 20 minutes. The THF was distilled off and theresidue was diluted with aqueous sodium chloride solution and extractedwith AcOEt (50 ml×3). The extract was dried over MgSO₄ and the AcOEt wasdistilled off. The procedure gave 3.30 g of crudeS-methyl-N-(6-chloro-3-pyridylmethyl)-N'-dimethylisothiourea as oil.

NMR (CDCl₃) δ: 2.30 (s, MeS), 2.98 (s, Me₂ N), 4.69 (s, CH₂) 7.25 (d,J=8 Hz, 1 H), 7.65 (dd, J=8 & 2 Hz, 1 H), 8.37 (d, J=2 Hz, 1 H)

(4) To 3.24 g (0.0133 mole in terms of pure products) of crudeS-methyl-N-(6-chloro-3-pyridylmethyl)-N'-dimethylisothiourea was added14.5 ml of CH₃ NO₂ and the mixture was refluxed with stirring for 14.5hours. The CH₃ NO₂ was then distilled off and the residue was subjectedto silica gel (240 g) column chromatography using MeOH-CHCl₃ (1:5) asthe eluent to recover an oil. This oil was dissolved in AcOEt, the AcOEtwas distilled off, and the residue was allowed to stand, whereuponcrystals separated out. After addition of Et₂ O, the crystals wererecovered by filtration, washed with Et₂ O and dried. The procedure gave2.30 g of the title compound as pale yellow crystals. This product wasin agreement with Compound 46 obtained in Example 28 in melting point,NMR and IR spectra and TLC Rf.

Example 89 1-(6-Chloro-3-pyridyl)amino-1-dimethylamino-2-nitroethylene(Compound 107) ##STR101##

A mixture of 1.5 g (0.0093 mole) of1-dimethylamino-1-methylthio-2-nitroethylene and 1.1 g of5-amino-2-chloropyridine was heated at 110-120° C. with stirring for 1hour. After cooling, the reaction mixture was subjected to silica gelcolumn chromatography using EtOH-CHCl₃ (1:40) as the eluent to recover0.38 g of the title compound as pale brown crystals. The NMR spectrum ofthis product showed that it was a 1:1 mixture of the title compound andN² -(6-chloro-3-pyridyl)-N'-dimethyl-2-nitroacetamidine.

m.p.: 122-123° C.

NMR (CDCl₃) δ: 2.86 (3 H, s), 3.10 (3 H, s), 5.17 (1 H, s), 6.68 (0.5 H,S), 7.09 (0.5 H, dd, J=9.0 & 2.7 Hz), 7.24 (0.5 H, d, J=9.0 Hz), 7.3-7.6(1 H, m), 7.86 (0.5 H, d, J=2.7 Hz), 8.22 (0.5 H, d, J=2.7 Hz),10.8-11.2 (0.5 H, br)

IR (Nujol): 3100, 1395, 1280 cm⁻¹

Example 901-[N-(6-Methoxy-3-pyridyl)-N-methyl]amino-1-methylamino-2-nitroethylene(Compound 108) ##STR102##

The steps (1), (2) and (3) of Example 59 were repeated except that2-methoxy-5-methylaminopyridine was used in lieu of2-chloro-5-methylaminopyridine to give the following compounds in therespective steps.

(1) N-(6-Methoxy-3-pyridyl)-N-methyl-N'-methylthiourea (white crystals)

(provided that the reaction was conducted in toluene)

m.p.: 115.5-116° C.

NMR (CDCl₃) δ: 3.06 (3 H, d, J=4.5 Hz), 3.65 (3 H, s), 3.97 (3 H, s),5.2-5.8 (1 H, m, NH), 6.86 (1 H, d, J=8.7 Hz), 7.46 (1 H, dd, J=9.0 &3.0 Hz), 8.08 (1 H, d, J=2.4 Hz)

(2) S-Methyl-N-(6-methoxy-3-pyridyl)-N-methyl-N'-methylisothiourea (paleyellow oil)

NMR (CDCl₃) δ: 2.01 (3 H, s), 3.18 (3 H, s), 3.28 (3 H, s), 3.93 (3 H,s,), 6.72 (1 H, d, J=9.0 Hz), 7.43 (1 H, dd, J=9.0 & 3.0 Hz), 8.02 (1 H,d, J=2.4 Hz)

(3) Title compound (yellow crystals)

(provided that the reaction was conducted for 16 hours)

m.p.: 131-132° C.

NMR (CDCl₃) δ: 2.65 (3 H, d, J=5.4 Hz), 3.27 (3 H, s), 3.96 (3 H, s),6.07 (1H, s), 6.82 (1 H, d, J=9.0 Hz), 7.43 (1 H, dd, J=8.4 & 3.0 Hz),8.04 (1 H, d, J=2.7 Hz), 9.8-10.4 (1 H, m)

IR (Nujol): 3130, 1590 cm⁻¹

Example 911-[N-(6-Chloro-3-pyridyl)-N-methyl]amino-1-methylamino-2-ethoxycarbonyl-2-nitroethylene(Compound 109) ##STR103##

A mixture of 2.0 g (0.0087 mole) ofS-methyl-N-(6-chloro-3-pyridyl)-N-methyl-N'-methylisothiourea and 4.0 gof ethyl nitroacetate was stirred with heating at 90-100° C. for 6hours. After cooling, a small amount of acetone was added and theresulting crystals were collected by filtration, washed with acetone anddried. The procedure gave 0.3 g of the title compound as white crystals.From the filtrate, acetone was distilled off and the residue was furtherstirred with heating at 90-100° C. for 16 hours. The procedure gave afurhter crop (0.2 g) of the title compound.

m.p.: 225-227° C. (decompn.)

NMR (DMSO-d₆) δ: 1.10 (3 H, t, J=6.9 Hz), 2.89 (3 H, s), 3.45 (3 H, s),3.93 (2 H, q, J=7.3 Hz), 7.60 (1 H, d, J=8.4 Hz), 7.75 (1 H, dd, J=8.1 &2.7 Hz), 8.30 (1 H, d, J=2.1 Hz), 9.31 (1 H, br s)

IR (Nujol): 3190, 1675, 1630 cm⁻¹

Example 921-[N-(6-Chloro-3-pyridylmethyl)-N-methyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Comnound 110) ##STR104##

The reaction procedure of Example 46 was repeated except that1-[N-(6-chloro-3-pyridylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene togive the title compound as a yellow resinous mass.

NMR (DMSO-d₆) δ: 2.92 (s, 3 H), 3.03 (s, 3 H), 4.60 (br, 2 H), 6.86 (s,1 H), 7.48 (d, J=8 Hz, 1 H), 7.80 (dd, J=8 & 2 Hz, 1 H), 8.23 (s, 1 H),8.38 (d, J=2 Hz, 1 H)

IR (neat): 1690, 1560, 1490, 1350, 1270, 1100 cm⁻¹

Example 93

1-[N-(6-Chloro-3-pyridylmethyl)-N-ethyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 111) ##STR105##

The reaction procedure of Example 46 was repeated except that1-[N-(6-chloro-3-pyridylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene togive the title compound as a yellow resinous mass.

NMR (DMSO-d₆) δ: 1.13 (t, J=7 Hz, 3 H), 3.00 (s, 3 H), 3.10-3.53 (m, 2H), 4.60 (br, 2 H), 6.96 (s, 1 H), 7.48 (d, J=8 Hz, 1 H), 7.82 (dd, J=8& 2 Hz, 1 H), 8.20 (s, 1 H), 8.39 (d, J=2 Hz, 1 H)

IR (neat): 1685, 1560, 1480, 1340, 1240, 1100 cm⁻¹

Example 941-[N-(6-Chloro-3-pyridyl)-N-methyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 112) ##STR106##

The reaction procedure of Example 46 was repeated except that1-[N-(6-chloro-3-pyridyl)-N-methyl]amino-1-methylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl))]amino-2-nitroethylene togive the title compound as yellow crystals.

m.p.: 134-135° C.

NMR (DMSO-d₆) δ: 2.73 & 2.89 (each s, 3 H), 3.32 & 3.39 (each s, 3 H),7.03 & 7.10 (each s, 1 H), 7.46 & 7.57 (each d, J=8 Hz, 1 H), 7.83 &7.92 (each dd, J=8 & 2 Hz, 1 H), 8.35 & 8.70 (each s, 1 H), 8.37 & 8.44(each d, J=2 Hz, 1 H)

IR (Nujol): 1685, 1560, 1305, 1280, 1250, 1135 cm⁻¹

Example 951-[N'-(6-Chloro-3-pyridylmethyl)-N-formyl]amino-1-dimethylamino-2-nitroethylene(Compound 113) ##STR107##

The reaction procedure of Example 46 was repeated except that1-N-(6-chloro-3-pyridylmethyl)amino-1-dimethylamino-2-nitroethylene wasused in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene togive the title compound as pale yellow crystals.

m.p.: 105-106° C.

NMR (DMSO-d₆) δ: 2.93 (s, 6 H), 4.33-5.10 (m, 2 H), 6.72 (s, 1 H), 7.42(d, J=8 Hz, 1 H), 7.80 (dd, J=8 & 2 Hz, 1 H), 8.23 (s, 1 H), 3.36 (d,J=2 Hz, 1 H)

IR (Nujol); 1700, 1565, 1490, 1350, 1270, 1205, 1100 cm⁻¹

Example 96

A 7:3 mixture of1-(6-chloro-3-pyridylmethyl)amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 114) and1-[N-(6-chloro-3-pyridylmethyl)-N-formyl]amino-1-methylamino-2-nitroethylene(Compound 115) ##STR108##

In 10 ml of DMF was suspended 0.1 g of 60% sodium hydride, previouslywashed with petroleum ether, and a solution of 0.6 g (0.0025 mole) of1-N-(6-chloro-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene in 3ml of DMF was added dropwise. The mixture was stirred at roomtemperature for 1 hour. After cooling, 0.7 g of formic acetic anhydridewas added and the mixture was stirred under ice-cooling for 5 hours and,then, at room temperature for 20 hours. The DMF was distilled off underreduced pressure and the residue was diluted with 20 ml of saturatedaqueous sodium hydrogen carbonate solution and extracted with CH₂ Cl₂(20 ml×3). The extract was dried over MgSO₄ and the CH₂ Cl₂ wasdistilled off. Finally, the residue was subjected to silica gel columnchromatography using EtOH-CHCl₃ (1:10) as the eluent. The procedure gave0.15 g of a 7:3 mixture of the title compounds (Compound 114 andCompound 115) as white crystals.

m.p.: 80-85° C.

NMR (DMSO-d₆) δ: (Compound 114) 3.05 (s, 3 H), 4.53 (d, J=6 Hz, 2 H),6.76 (s, 1 H), 7.49 (d, J=8 H , 1 H), 7.86 (dd, J=8 & 2 Hz, 1 H), 8.30(s, 1 H), 8.42 (d, J=2 Hz, 1 H), 9.45 (br, 1 H) (Compound 115) 2.95 (d,J=5 Hz, 3 H), 4.83 (s, 2 H), 6.66 (s, 1 H), 7.46 (d, J=8 Hz, 1 H), 7.86(dd, J=8 & 2 Hz, 1 H), 8.30 (s, 1 H), 8.42 (d, J=2 Hz, 1 H), 9.45 (br, 1H)

IR (Nujol): 3200, 3100, 1685, 1600, 1340, 1250, 1080, 1040 cm⁻¹

Example 971-(6-Chloro-3-pyridylmethyl)amino-1-methylamino-2-ethoxycarbonyl-2-nitroethylene(Compound 116) ##STR109##

A mixture of 1.4 g (0.0061 mole) ofS-methyl-N-(6-chloro-3-pyridylmethyl)-N'-methylisothiourea obtained inExample 64 (2) and 2.7 g of ethyl nitroacetate was stirred with heatingat 75-80° C. for 3 hours. After cooling, the crystals were collected byfiltration, washed with CH₃ CN and dried. The procedure gave 1.1 g ofthe title compound as white crystals.

m.p.: 231-233° C. (decompn.)

NMR (DMSO-d₆) δ: 1.07 (3 H, t, J=7 Hz), 2.86 (3 H, br s), 3.94 (2 H, q,J=7 Hz), 4.47 (2 H, br s), 7.51 (1 H, d, J=8 Hz), 7.82 (1 H, dd, J=8 &2.7 Hz), 8.38 (1 H, d, J=2.7 Hz), 9.10-9.60 (2 H, br s)

IR (Nujol): 3250, 1660, 1500, 1320, 1230 cm⁻¹

Example 981-(6-Chloro-3-pyridylmethyl)amino-1-methylamino-2-methanesulfonylthiocarbamoyl-2-nitroethylene(Compound 117) ##STR110##

In 50 ml of CH₃ CN was dissolved 0.50 g (0.002 mole) of1-(6-chloro-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene,followed by addition of 0.30 g (0.002 mole) of methanesulfonylisothiocyanate. The mixture was stirred at room temperature for 2 hours.The CH₃ CN was distilled off and the residue was purified by silica gelcolumn chromatography. The procedure gave 0.25 g of the title compoundas yellow crystals.

m.p.: 129-131° C.

NMR (DMSO-d₆) δ: 2.76-3.00 (each d, MeN), 3.51 & 3.55 (each s, MeSO₂),4.36-4.70 (each d), 12.20-13.23 (each s)

IR (Nujol): 3200, 1640, 1340, 1140, 920 cm⁻¹

Example 991-N-(6-Bromo-3-pyridylmethyl)amino-1-methylamino-2-nitroetylene(Compound 118) ##STR111##

The steps (1), (2) and (3) of Example 13 were repeated except that6-bromo-3-pyridylmethylamine was used in lieu ofN-ethyl-N-(3-pyridylmethyl)amine, to give the following compounds in therespective steps.

(1) N-(6-Bromo-3-pyridylmethyl)-N'-methylthiourea (white crystals)

(provided that Et₂ O-THF (3:1) was used as the reaction solvent)

m.p.: 117-118° C.

NMR(DMSO-d₆)δ: 2.85 (d,J=5Hz,MeN), 4.67 (d,J=6Hz,CH₂ N), 7.54 (d,J=8Hz,1H), 7.6 (br, MeNH), 7.69 (dd, J=8 & 2 Hz, 1H), 7.93 (t, J=6Hz,CH₂ NH),8.32 (d,J=2Hz, 1H)

(2) S-Methyl-N-(6-Bromo-3-pyridylmethyl)-N'-methylisothiourea (yellowoil)

NMR(CDCl₃)δ: 2.40 (s,MeS), 2.93 (s,MeN=), 4.34(br,NH), 4.47 (S,CH₂ N),7.42 (d,J=8Hz,1H), 7.61 (dd,J=8 & 2Hz,1H), 8.36 (d,J=2Hz,1H)

(3) Title compound (pale brown crystals)

m.p.: 184-186° C. (decompn.)

NMR(DMSO-d₆)δ: 2.37 (br. MeN), 4.47 (d,J=6Hz,CH₂ N), 6.46 (s,=CHNO₂),7.61 (d,J=8Hz,1H), 7.72 (dd,J=8 & 2Hz,1H), 8.40 (d,J=2Hz,1H)

IR (Nujol): 1615, 1575, 1455, 1370, 1230, 1200 cm⁻¹

Example 100

1-N-(6-Bromo-3-pyridylmethyl)amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 119) and1-[N-(6-bromo-3-pyridylmethyl)-N-formyl]amino-1-methylamino-2-nitroethylene(Compound 120) ##STR112##

The reaction procedure of Example 96 was repeated except that1-N-(6-bromo-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene wasused in lieu of1-N-(6-chloro-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene. Tothe oil obtained through the purification of silica gel columnchromatography, was added a small amount of AcOEt and Et₂ O, followed bycooling with dry ice-acetone bath to give a mixture (90:10) of the titlecompounds (Compound 119 and Compound 120) as pale brown powder. And, thefiltrate was concentrated to give a mixture (40:60) of the titlecompounds (Compound 119 and Compound 120) as viscous product.

(the 90:10 mixture of Compounds 119 and 120)

m.p.: 115-127° C.

NMR(CDCl₃)δ: (Compound 119) 3.13 (s,MeN), 4.48 (d,J=6Hz,CH₂ N), 6.57(s,=CHNO₂), 7.53 (m,2H,pyridine-H₂), 8.33 (S,2H,CHO and pyridine-H),9.46 (br,NH)

IR (Nujol): 1690, 1620, 1250, 1240, 1080 cm⁻¹ (the 40:60 mixture ofCompounds 119 and 120)

NMR(CDCl₃)δ: (Compound 120) 3.01 (d,J=5Hz,MeN), 4.73 (s,CH₂ N), 6.36(s,=CHNO₂), 7.53 (br s,2H,pyridine-H₂), 8.34 (br s,2H,CHO andpyridine-H₁), 9.35 (br,NH)

IR (neat): 1680, 1605, 1450, 1350, 1250, 1080 cm⁻¹

Example 1011-[N-(2-Chloro-5-thiazolylmethyl)-N-methyl)amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 121) ##STR113##

The reaction procedure of Example 46 was repeated except that1-[N-(2-chloro-5-thiazolylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)amino-2-nitroethylene, togive the title compound as pale yellow resinous product.

NMR(DMSO-d₆)δ: 2.92 (s,3H,MeNCH₂), 2.99 (s,3H,MeNCHO), 4.74 (brs,2H,CH₂), 6.90 (s,1H,=CHNO₂), 7.71 (s,1H, thiazole-H), 8.19 (s,1H,CHO)

IR (neat): 1695, 1565, 1490, 1340, 1270, 1042 cm⁻¹

Example 1021-[N-(2-Chloro-5-thiazolylmethyl)-N-ethyl)amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 122) ##STR114##

The reaction procedure of Example 46 was repeated except that1-[N-(2-chloro-5-thiazolylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene, togive the title compound as yellow crystals.

m.p.: 99-100° C.

NMR(DMSO-d₆)δ: 1.15 (t,3H,CH₂ CH₃), 2.98 (s,3H,MeN), 3.32 (q,2H,CH₂CH₃), 4.76 (br s,2H,thiazole-CH₂), 7.02 (s,1H, =CHNO₂), 7.72(s,1H,thiazole-H), 8.17 (s,1H,CHO)

IR (Nujol): 1698, 1577, 1557, 1470, 1448, 1352, 1315, 1270, 1053 cm⁻¹

Example 103

1-N-(2-Chloro-5-thiazolylmethyl)amino-1-[N-formyl-N-methyl)amino-2-nitroethylene(Compound 123) and1-[N-(2-chloro-5-thiazolylmethyl)-N-formyl]amino-1-methylamino-2-nitroethylene(Compound 124) ##STR115##

The reaction procedure of Example 100 was repeated except that1-N-(2-chloro-5-thiazolylmethyl)amino-1-methylamino-2-nitroethylene wasused in lieu of1-N-(6-bromo-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene, togive the title compound (Compound 124) as crystals and a mixture (70:30)of the title compounds (Compound 123 and Compound 124) as viscousproduct.

(Compound 124)

m.p.: 125-126° C.

NMR(CDCl₃)δ: 3.01 (3H,d,J=6.0 Hz), 4.82 (2H,s), 6.38 (1H,s), 7.49(1H,s), 8.30 (1H,s), 9.0-9.6 (1H,br)

IR (Nujol): 3220, 1675, 1620, 1245, 1100, 1050 cm⁻¹ (the 70:30 mixtureof Compounds 123 and 124)

NMR(CDCl₃)δ: (Compound 123) 3.16 (3H,s), 4.63 (2H,d,J=5.7 Hz), 6.57(1H,s), 7.49 (1H,s), 8.35 (1H,s), 9.1-9.6 (1H,br)

IR (neat): 3220, 1680, 1605, 1480, 1250, 1045 cm⁻¹

Example 1041-[N-(6-Bromo-3-pyridylmethyl)-N-methyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 125) ##STR116##

The reaction procedure of Example 46 was repeated except that1-[N-(6-bromo-3-pyridylmethyl)-N-methyl]amino-1-metylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene, togive the title compound as yellow resinous product.

(provided that THF-DMF was used as the reaction solvent)

NMR(DMSO-d₆)δ: 2.93 (s,3H), 3.02 (s,3H), 4.3-4.9 (m,2H), 6.87(s,=CHNO₂), 7.68 (br s,2H), 8.23 (s,CHO), 8.3-8.5 (m,1H)

IR (neat): 1685 cm⁻¹

Example 1051-[N-(6-Bromo-3-pyridylmethyl)-N-ethyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene(Compound 126) ##STR117##

The reaction procedure of Example 46 was repeated except that1-[N-(6-bromo-3-pyridylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene, togive the title compound as yellow crystals.

m.p.: 105-108° C.

NMR(DMSO-d₆)δ: 1.13 (t,J=7.2 Hz,3H), 3.00 (s,3H), 3.1-3.7 (m,2H),4.3-4.9 (m,2H), 6.97 (s,=CHNO₂), 7.5-7.9 (m,2H), 8.21 (s,CHO), 8.38 (brs,1H)

IR (Nujol): 1705 cm⁻¹

Example 1061-N-(6-Bromo-3-pyridylmethyl)amino-1-dimethylamino-2-nitroethylene(Compound 127) ##STR118##

The steps (1), (2), (3) and (4) of Example 88 were repeated except that6-bromo-3-pyridylmethylamine was used in lieu of6-chloro-3-pyridylmethylamine, to give the following compounds in therespective steps.

(1) (6-Bromo-3-pyridyl)methyl isothiocyanate (yellow oil)

(provided that after completion of dropwise addition of ethylchlorocarbonate, the mixture was stirred at 50° C. for 4 hours)

NMR(CDCl₃)δ: 4.73 (s,2H), 7.43-7.70 (m,2H), 8.35 (br s,1H)

(2) N-(6-Bromo-3-pyridylmethyl)-N'-dimethylthiourea (white crystals)

(provided that the product was purified by silica gel columnchromatography using E_(t) OH-CHCl₃ (1:10) as the eluent)

m.p.: 124-125° C.

NMR(CDCl₃)δ: 3.27 (s,6H), 4.85 (d,J=5 Hz,2H), 6.32 (br t,J=5Hz,1H), 7.40(d,J=8Hz,1H), 7.66 (dd,J=8 & 2 Hz,1H), 8.21 (d,J=2Hz,1H)

(3) S-Methyl-N-(6-bromo-3-pyridylmethyl)-N'-dimethylisothiourea (yellowoil)

NMR(CDCl₃)δ: 2.30 (s,3H), 3.00 (s,6H), 4.66 (s,2H), 7.38 (d,J=8Hz,1H),7.55 (dd,J=8 & 2 Hz,1H), 8.35 (d,J=2 Hz,1H)

(4) Title compound (pale yellow crystals)

(provided that the reaction was conducted for 20 hours, and the productwas purified by silica gel column chromatography and recrystallized fromCH₃ CN.

m.p.: 158-159° C.

NMR(CDCl₃)δ: 2.92 (s,6H), 4.45 (d,J=6 Hz,2H), 6.50 (s,1H), 7.48 (d,J=8Hz,1H), 7.60 (dd,J=8 & 2 Hz,1H), 8.33 (d,J=2 Hz,1H), 9.70 (br,1H)

IR (Nujol): 3100, 1580, 1550, 1440, 1300, 1260, 1040 cm⁻¹

Example 1071-[N-(6-Bromo-3-pyridylmethyl)-N-formyl]amino-1-dimethylamino-2-nitroethylene(Compound 128) ##STR119##

The reaction procedure of Example 46 was repeated except that1-N-(6-bromo-3-pyridylmethyl)amino-1-dimethylamino-2-nitroethylene wasused in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene, togive the title compound as pale yellow crystals.

(provided that the reaction was conducted in DMF)

m.p.: 96-97° C.

NMR(DMSO-d₆)δ: 2.92 (s,6H), 4.30-5.06 (m,2H), 6.73 (s,1H), 7.50-7.80(m,2H) 8.23 (s,1H), 8.35 (br s,1H)

IR (Nujol): 1700, 1565, 1490, 1345, 1270, 1080 cm⁻¹

Example 1081-Amino-1-[N-(6-bromo-3-pyridylmethyl)-N-methyl]amino-2-nitroethylene(Compound 129) ##STR120##

The steps (1) and (2) of Example 40 were repeated except thatN-(6-bromo-3-pyridylmethyl)-N-methylamine was used in lieu ofN-(6-chloro-3-pyridylmethyl)-N-ethylamine, to give the followingcompounds in the respective steps.

(1)1-[N-(6-Bromo-3-pyridylmethyl)-N-methyl]amino-1-methylthio-2-nitroethylene(yellow oil)

(provided that the reaction was conducted for 3.5 hours)

NMR(CDCl₃)δ: 2.47 (s,3H), 3.03 (s,3H), 4.73 (s,2H), 6.76 (s,1H),7.36-7.60 (m,2H), 8.30 (br s,1H)

(2) Title compound (white crystals)

(provided that the reaction was conducted in MeOH for 1 hour, and theprecipitated crystals were collected by filtration)

m.p.: 206-207° C.

NMR(DMSO-d₆)δ: 3.03 (s,3H), 4.63 (s,2H), 6.60 (s,1H), 7.43-7.80 (m,2H),8.30 (br s,1H), 8.88 (br,2H)

IR (Nujol): 3260, 3140, 1620, 1575, 1420, 1290, 1220 cm⁻¹

Example 1091-N-(2-Chloro-5-thiazolylmethyl)amino-1-dimethylamino-2-nitroethylene(Compound 104)

The steps (1), (2), (3) and (4) of Example 88 were repeated except that2-chloro-5-thiazolylmethylamine was used in lieu of6-chloro-3-pyridylmethylamine, to give the following compounds in therespective steps.

(1) (2-Chloro-5-thiazolyl)methyl isothiocyanate

(provided that after completion of dropwise addition of ethylchlorocarbonate, the mixture was stirred at 80° C. for 3 hours)

NMR(CDCl₃)δ: 4.82 (2H,s), 7.50 (1H,s)

(2) N-(2-Chloro-5-thiazolylmethyl)-N'-dimethylthiourea (yellow crystals)

m.p.: 125-127° C.

NMR(CDCl₃)δ: 3.28 (6H,s), 4.98 (2H,d,J=6.0 Hz), 5.6-6.1 (1H,br), 7.40(1H,s)

(3) S-Methyl-N-(2-chloro-5-thiazolylmethyl)-N-dimethylisothiourea(yellow oil)

NMR(CDCl₃)δ: 2.31 (3H,s), 2.99 (6H,s), 4.79 (2H,s), 7.36 (1H,s)

(4) Title compound (pale grey crystals)

(provided that the reaction was conducted for 37° C.)

This product was in agreement with Compound 104 obtained in Example 86in melting point, NMR and IR spectra and TLC Rf.

Example 1101-[N-(2-Chloro-5-thiazolylmethyl)-N-formyl]amino-1-dimethylamino-2-nitroethylene(Compound 130) ##STR121##

The reaction procedure of Example 46 was repeated except that1-N-(2-chloro-5-thiazolylmethyl)amino-1-dimethylamino-2-nitroethylenewas used in lieu of1-methylamino-1-[N-methyl-N-(3-pyridylmethyl)]amino-2-nitroethylene, togive the title compound as white crystals. The NMR value of this productindicated this product was a mixture (6:1) of isomers.

m.p.: 139-142° C.

NMR(CDCl₃)δ: 2.92 & 2.99 (total 6H, each s), 4.83 (2H,s), 6.61 & 6.34(total 1H,s), 7.45 (1H,s), 8.19 & 8.46 (total 1H, each s)

IR (Nujol): 1680, 1410, 1355, 1270, 1050 cm⁻¹

Example 1111-[N-(6-Chloro-3-pyridylmethyl)-N-(2,2,2-trifluoroethyl)]amino-1-methylamino-2-nitroethylene(Compound 131) ##STR122##

In 35 ml of toluene, 3.79 g (0.0169 mole) ofN-(6-chloro-3-pyridylmethyl)-N-(2,2,2-trifluoroethyl)amine and 2.46 g ofmethyl isothiocyanate were stirred for 18 hours under reflux. Thetoluene was distilled off, and the residue was dissolved in 120 ml ofAcOEt, washed with 1N HCl (two times) and aqueous sodium chloridesolution in this order and dried over MgSO₄. The AcOEt was distilled offto give oil. To this oily product were added Et₂ O and hexane, followedby cooling to give crystals. After addition of hexane to the mixture,the crystals were collected by filtration and dried to give 2.78 g ofN-(6-chloro-3-pyridylmethyl)-N-(2,2,2-trifluoroethyl)-N'-methylthioureaas white crystals.

m.p.: 98-100° C.

NMR(CDCl₃)δ: 3.13 (d,J=5 Hz,MeN), 4.37 (q,J=9 Hz,CF₃ CH₂), 5.09(s,pyridine-CH₂), 6.07 (br,NH), 7.34 (d,J=8 Hz,1H), 7.67 (dd,J=8 & 2Hz,1H), 8.26 (d,J=2 Hz,1H)

The steps (2) and (3) of Example 13 were repeated except thatN-(6-chloro-3-pyridylmethyl)-N-(2,2,2-trifluoroethyl)-N'-methylthioureawas used in lieu of N-methyl-N'-ethyl-N'-(3-pyridylmethyl)thiourea, togive the following compounds in the respective steps.

(2)S-Methyl-N-(6-chloro-3-pyridylmethyl)-N-(2,2,2-trifluoroethyl)-N'-methylisothiourea(pale brown oil)

NMR(CDCl₃)δ: 2.28 (s,MeS), 3.24 (s,MeN), 4.07 (q,J=9 Hz,CF₃ CH₂), 4.66(s,pyridine-CH₂), 7.28 (d,J=8 Hz,1H), 7.54 (dd,J=8 & 2 Hz,1H), 8.26(d,J=2 Hz,1H)

(3) Title compound

(provided that the reaction was conducted for 96 hours)

m.p.: 110-111° C.

NMR(CDCl₃)δ: 3.12 (d,J=5 Hz,MeN), 3.60 (q,J=9 Hz,CF₃ CH₂), 4.42(s,pyridine-CH₂), 6.51 (s,=CHNO₂), 7.39 (d,J=8 Hz,1H), 7.60 (dd,J=8 & 2Hz,1H), 8.33 (d,J=2 Hz,1H), 9.50 (br,NH)

IR (Nujol): 1595, 1450, 1345, 1260, 1235, 1140, 1100 cm⁻¹

As the object compound (I) of the invention, the following compounds canbe synthesized.

(1)1-[N-(6-Chloro-3-pyridylmethyl)-N-formyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(2)1-[N-(6-Chloro-3-pyridylmethyl)-N-ethyl]amino-1-dimethylamino-2-nitroethylene

(3)1-[N-6-Chloro-3-pyridylmethyl)-N-(2-fluoroethyl)]amino-1-methylamino-2-nitroethylene

(4)1-[N-(6-Chloro-3-pyridylmethyl)-N-(2-fluoroethyl)]amino-1-dimethylamino-2-nitroethylene

(5)1-[N-(2-Chloro-5-thiazolylmethyl)-N-formyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(6)1-[N-(6-Bromo-3-pyridylmethyl)-N-(2-fluoroethyl)]amino-1-methylamino-2-nitroethylene

(7)1-[N-(6-Bromo-3-pyridylmethyl)-N-(2-fluoroethyl)]amino-1-dimethylamino-2-nitroethylene

(8)1-[N-(2-Chloro-5-thiazolylmethyl)-N-(2-fluoroethyl)]amino-1-methylamino-2-nitroethylene

(9)1-[N-(2-Chloro-5-thiazolylmethyl)-N-methyl]amino-1-dimethylamino-2-nitroethylene

(10)1-[N-(2-Chloro-5-thiazolylmethyl)-N-ethyl]amino-1-dimethylamino-2-nitroethylene

(11) 1-(2-Bromo-5-thiazolylmethyl)amino-1-methylamino-2-nitroethylene

(12)1-[N-(2-Bromo-5-thiazolylmethyl)-N-formyl]amino-1-methylamino-2-nitroethylene

(13)1-[N-(2-Bromo-5-thiazolylmethyl)-N-methyl]amino-1-methylamino-2-nitroethylene

(14)1-[N-(2-Bromo-5-thiazolylmethyl)-N-ethyl]amino-1-methylamino-2-nitroethylene

(15)1-(2-Bromo-5-thiazolylmethyl)amino-1-N-formyl-N-methylamino-2-nitroethylen

(16)1-[N-(2-Bromo-5-thiazolylmethyl)-N-formyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(17)1-[N-(2-Bromo-5-thiazolylmethyl)-N-methyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(18)1-[N-(2-Bromo-5-thiazolylmethyl)-N-ethyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(19)1-[N-(2-Chloro-5-thiazolylmethyl)-N-(2-fluoroethyl)]amino-1-dimethylamino-2-nitroethylene

(20)1-[N-(2-Bromo-5-thiazolylmethyl)-N-formyl]amino-1-dimethylamino-2-nitroethylene

(21)1-[N-(2-Bromo-5-thiazolylmethyl)-N-methyl]amino-1-dimethylamino-2-nitroethylene

(22)1-[N-(2-Bromo-5-thiazolylmethyl)-N-ethyl]amino-1-dimethylamino-2-nitroethylene

(23)1-[N-Chloromethyl-N-(6-chloro-3-pyridylmethyl)]amino-1-methylamino-2-nitroethylene

(24)1-[N-(6-Bromo-3-pyridylmethyl)-N-chloromethyl]amino-1-methylamino-2-nitroethylene

(25)1-[N-Chloromethyl-N-(2-chloro-5-thiazolylmethyl)]amino-1-methylamino-2-nitroethylene

(26)1-[N-(6-Bromo-3-pyridylmethyl)-N-formyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(27)1-[N-(2-Bromo-5-thiazolylmethyl)-N-(2-fluoroethyl)]amino-1-methylamino-2-nitroethylene

(28)1-[N-(2-Bromo-5-thiazolylmethyl)-N-(2-fluoroethyl)]amino-1-dimethylamino-2-nitroethylene

(29)1-[N-(2-Chloro-5-thiazolylmethyl)-N-(2,2,2-trifluoroethyl)]amino-1-methylamino-2-nitroethylene

(30)1-[N-(6-Bromo-3-pyridylmethyl)-N-(2,2,2-trifluoromethyl)]amino-1-dimethylamino-2-nitroethylene

(31)1-[N-(6-Bromo-3-pyridylmethyl)-N-methyl]amino-1-dimethylamino-2-nitroethylene

(32)1-[N-(6-Bromo-3-pyridylmethyl)-N-ethyl]amino-1-dimethylamino-2-nitroethylene

(33) 1-(6-Fluoro-3-pyridylmethyl)amino-1-methylamino-2-nitroethylene

(34)1-[N-(6-Fluoro-3-pyridylmethyl)-N-formyl]amino-1-methylamino-2-nitroethylene

(35)1-(6-Fluoro-3-pyridylmethyl)amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(36)1-[N-(6-Fluoro-3-pyridylmethyl)-N-formyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(37)1-[N-(6-Fluoro-3-pyridylmethyl)-N-methyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(38)1-[N-(6-Fluoro-3-pyridylmethyl)-N-ethyl]amino-1-(N-formyl-N-methyl)amino-2-nitroethylene

(39) 1-Dimethylamino-1-(6-fluoro-3-pyridylmethyl)amino-2-nitroethylene

(40)1-Dimethylamino-1-[N-(6-fluoro-3-pyridylmethyl)-N-formyl]amino-2-nitroethylene

(41)1-Dimethylamino-1-[N-(6-fluoro-3-pyridylmethyl)-N-methyl]amino-2-nitroethylene

(42)1-Dimethylamino-1-[N-(6-fluoro-3-pyridylmethyl)-N-ethyl]amino-2-nitroethylene

Example 112

(Emulsifiable Concentrate)

An emulsifiable concentrate was manufactured by mixing the followingingredients.

    ______________________________________                                        Compound 17           20    weight %                                          Xylene                75    weight %                                          Polyoxyethylene glycol ether                                                                        5     weight %                                          (Nonipol 85 ®)                                                            ______________________________________                                    

Example 113

(Wettable Powder)

A wettable powder was manufactured by mixing the following ingredients.

    ______________________________________                                        Compound 12           20    weight %                                          Sodium ligninsulfonate                                                                              5     weight %                                          Polyoxyethylene glycol ether                                                                        5     weight %                                          (Nonipol 85 ®)                                                            White carbon          30    weight %                                          Clay                  40    weight %                                          ______________________________________                                    

Example 114

(Dust)

A dust was manufactured by mixing the following ingredients.

    ______________________________________                                        Compound 19         3     weight %                                            White carbon        3     weight %                                            Clay                94    weight %                                            ______________________________________                                    

Example 115

(Granules)

A granular product was prepared by admixing and granulating thefollowing components.

    ______________________________________                                        Compound 25          2     weight %                                           Sodium ligninsulfonate                                                                             5     weight %                                           Clay                 93    weight %                                           ______________________________________                                    

What we claim is:
 1. A method of combatting insects or mites, comprisingadministering an effective dose of a compound of the formula ##STR123##wherein one of X¹ and X² is an electron-attracting group with the otherbeing a hydrogen atom or an electron-attracting group, theelectron-attracting groups being cyano, nitro, C₁₋₄ alkoxycarbonyl,hydroxycarbonyl, phenoxycarbonyl, naphthyloxycarbonyl, C₁₋₄alkylsulfonyl which can be substituted with halogen, aminosulfonyl,di-C₁₋₄ alkoxyphosphoryl, C₁₋₄ alkylcarbonyl which can be substitutedwith halogen, C₁₋₄ alkylsulfonylthiocarbamoyl, carbamoyl, orheterocycleoxycarbonyl wherein the heterocycle moiety is defined belowas group D; orwherein one of X¹ and X² is a halogen atom; or wherein X¹and X² can join together with the adjacent carbon atom to form a ring ofthe formula ##STR124## R¹ is --NR³ R⁴ which is attached through itsnitrogen atom; R³ is a hydrogen atom, a C₁₋₆ alkyl group, a phenylgroup, a naphthyl group, a C₇₋₉ phenylalkyl group, a heterocyclic groupdefined below as the group D, a C₁₋₄ alkanoyl, a benzoyl group, anaphthoyl group, a C₁₋₄ alkoxy-carbonyl group, a phenoxycarbonyl group,a naphthoxycarbonyl group, a heterocycleoxycarbonyl group wherein theheterocycle moiety is defined below as the group D, a phenylsulfonylgroup, a naphthylsulfonyl group, a C₁₋₄ alkylsulfonyl group, a di-C₁₋₄alkoxyphosphoryl group, a C₁₋₄ alkoxy group, a hydroxy group, an aminogroup, a di-C₁₋₄ alkylamino group, a C₁₋₄ alkanoylamino group, a C₁₋₄alkoxycarbonylamino group, a C₁₋₄ alkylsulfonylamino group, a di-C₁₋₄alkoxyphosphorylamino group, a C₇₋₉ phenylalkyloxy group or a C₁₋₄alkoxy-carbonyl-C₁₋₄ alkyl group; R⁴ is a hydrogen atom, or a C₁₋₄alkyl, C₃₋₆ cycloalkyl, C₂₋₄ alkenyl C₃₋₆ cycloalkenyl or C₂₋₄ alkynylgroup which can optionally be substituted by 1 to 3 substituentsselected from hydroxyl, C₁₋₄ alkoxy, halogen, di-C₁₋₄ alkylamino, C₁₋₄alkylthio, C₁₋₃ alkylcarbonylamino, C₁₋₄ alkylsulfonylamino, tri-C₁₋₄alkylsilyl and pyridyl or thiazolyl which can be optionally substitutedwith a halogen atom, or R³ and R⁴ can, taken together with the adjacentnitrogen atom, constitute a pyrrolidino, methylpiperazino, morpholino,or piperidino group, R² is:(i) a C₁₋₄ alkylcarbonyl, C₁₋₄ alkyl, C₂₋₄alkenyl, C₃₋₆ cycloalkyl, phenyl, naphthyl, C₇₋₉ phenylalkyl or aheterocyclic group defined below as the group D, which can besubstituted by 1 to 3 substituents selected from the group consisting ofa C₁₋₄ alkylthio group, a C₁₋₄ alkoxy group, a mono-C₁₋₄ alkylaminogroup, a di-C₁₋₄ alkylamino group, a C₁₋₄ alkoxy-carbonyl group, a C₁₋₄-alkylsulfonyl group, a halogen atom and a C₁₋₄ alkanoyl group, or (ii)a C₁₋₄ alkoxy, C₃₋₆ cycloalkoxy, C₂₋₄ alkenyloxy, C₃₋₆ cycloalkenyloxy,ethynyloxy, phenoxy, naphthoxy, a heterocycleoxy group, wherein theheterocycle moiety is defined below as the group D, or hydroxyl groupwhich can have 1 to 3 substituents selected from the group consisting ofhalogen and phenyl, or (iii) the group --NR³ R⁴ which is attachedthrough its nitrogen atom, or (iv) hydrogen; n is an integer equal to 0,1 or 2, and A⁰ is a substituted or unsubstituted heterocyclic groupdefined below as group D, provided that A⁰ is not a moiety selected fromthe group consisting of 2-, 3-, or 4-pyridyl and 2-, 4- or 5-thiazolyl;wherein the group D is a moiety selected from the group consisting of 2-or 3-thienyl, 2- or 3-furyl, 2- or 3-pyrrolyl, 2-, 3- or 4-pyridyl, 2-,4- or 5-oxazolyl, 2-, 4- or 5-thiazolyl, 3-, 4- or 5-pyrazolyl, 2-, 4-or 5-imidazolyl, 3-, 4- or 5-isoxazolyl, 3-, 4- or 5-isothiazolyl, 3- or5-(1,2,4-oxadiazolyl), 1,3,4-oxadiazolyl, 3- or 5-(1,2,4-thiadiazolyl),1,3,4-thiadiazolyl, 4- or 5-(1,2,3-thiadiazolyl), 1,2,5-thiadiazolyl,1,2,3-triazolyl, 1,2,4-triazolyl, 1H- or 2H-tetrazolyl, N-oxido-2-, 3-or 4-pyridyl, 2-, 4- or 5-pyrimidinyl, N-oxido-2-, 4- or 5-pyrimidinyl,3- or 4-pyridazinyl, pyrazinyl, N-oxido-3- or 4-pyridazinyl, benzofuryl,benzothiazolyl, benzoxazolyl, triazinyl, oxotriazinyl, tetrazolo[1,5-b]pyridazinyl, triazolo[4,5-b]pyridazinyl, oxoimidazinyl,dioxotriazinyl, pyrrolidinyl, piperidinyl pyranyl, thiopyranyl,1,4-oxazinyl, morpholinyl, 1,4-thiazinyl, 1,3-thiazinyl, piperazinyl,benzimidazolyl, quinolyl, isoquinolyl, cinnolinyl, phthalazinyl,quinazolinyl, quinoxalinyl, indolizinyl, quinolizinyl,1,8-naphthyridinyl, purinyl, pteridinyl, dibenzofuranyl, carbazolyl,acridinyl, phenanthridinyl, phenazinyl, phenothiazinyl and phenoxazinylgroup, any of which can have 1 to 5 substituents selected from the groupconsisting of(i) a C₁₋₄ alkyl, (ii) C₃₋₆ cycloalkyl, (iii) phenyl,naphthyl, (iv) C₁₋₄ alkoxy, (v) C₃₋₆ cycloalkyloxy, (vi) phenoxy,naphthyloxy, (vii) C₇₋₁₂ phenylalkyloxy, (viii) C₁₋₄ alkylthio, (ix)C₃₋₆ cycloalkylthio, (x) phenylthio, naphthylthio, (xi) C₇₋₁₂phenylalkylthio, (xii) mono-C₁₋₄ alkylamino, (xiii) di-C₁₋₄ alkylamino,(xiv) C₃₋₆ cycloalkylamino, (xv) anilino, (xvi) C₇₋₁₂ phenylalkylamino,(xvii) halogen (xviii) C₁₋₄ alkoxycarbonyl, (xix) phenoxycarbonyl, (xx)C₃₋₆ cycloalkyloxycarbonyl, (xxi) C₇₋₁₂ phenylalkyloxycarbonyl, (xxii)C₁₋₅ alkanoyl, (xxiii) C₁₋₁₅ alkanoyloxy, (xxiv) carbamoyl,N-methylcarbamoyl, N,N-dimethylcarbamoyl, N-ethylcarbamoyl,N,N-diethylcarbamoyl, N-phenylcarbamoyl, pyrrolidinocarbamoyl,piperidinocarbamoyl, piperazinocarbamoyl, morpholinocarbamoyl,N-benzylcarbamoyl, (xxv) N-methylcarbamoyloxy, N,N-dimethylcarbamoyloxy,N-ethylcarbamoyloxy, N-benzylcarbamoyloxy, N,N-dibenzylcarbamoyloxy,N-phenylcarbamoyloxy, (xxvi) C₁₋₄ alkanoylamino, (xxvii) benzamido,(xxviii) C₁₋₄ alkoxycarbonylamino, (xxix) C₇₋₁₂ phenylalkyloxycarbonyl,(xxx) methanesulfonylamino, ethanesulfonylamino, butanesulfonylamino,benzenesulfonylamino, toluenesulfonylamino, naphthalenesulfonylamino,trifluoromethanesulfonylamino, 2-chloroethanesulfonylamino,2,2,2-trifluoromethanesulfonylamino, (xxxi) pyrrolidinyl, pyrrolyl,pyrazolyl, imidazolyl, furyl, thienyl, oxazolyl isoxazolyl,isothiazolyl, thiazolyl, piperidinyl, pyridyl, piperazinyl, pyrimidinyl,pyranyl, tetrahydropyranyl, tetrahydrofuryl, indolyl, quinolyl,1,3,4-oxadiazolyl, thieno[2,3-d]pyridyl, 1,2,3-thiadiazolyl,1,3,4-thiadiazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,3,4-triazolyl,tetrazolyl, 4,5-dihydro-1,3-dioxazolyl, tetrazolo[1,5-b]pyridazinyl,benzothiazolyl, benzoxazolyl, benzimidazolyl, benzothienyl, (xxxii)heterocyclethio, heterocycleoxy, heterocycleamino orheterocyclecarbonylamino group which is derived by attachment of any ofheterocyclic groups (xxxi) to the S, O, N atom or the carbonylaminogroup, (xxxiii) di-C₁₋₄ alkylphosphinothioylamino, (xxxiv) methoxyimino,ethoxyimino, 2-fluoroethoxyimino, carboxymethoxyimino,1-carboxy-1-methylethoxyimino,2,2,2-trichioroethoxycarbonylmethoxyimino,1-(2,2,2-trichloroethoxycarbonyl)-1-methylethoxyimino,(2-aminothiazol-4-yl) methoxyimino, (1H-imidazol-4-yl)methoxyimino,(xxxv) C₁₋₄ alkylsulfonyloxy, (xxxvi) benzenesulfonyloxy,toluenesulfonyloxy, (xxxvii) diphenylphosphinothioylamino, (xxxviii)thiocarbamoylthio, N-methylthiocarbamoylthio,N,N-dimethylthiocarbamoylthio, N-ethylthiocarbamoylthio,N-benzylthiocarbamoylthio, N,N-dibenzylthiocarbamoylthio,N-phenylthiocarbamoylthio, (xxxix) trimethylsilyloxy,t-butyldimethylsilyloxy, t-butyldiphenylsilyloxy,dimethylphenylsilyloxy, (xL) trimethylsilyl, t-butyldinethylsilyl,t-butyldiphenylsilyl, dimethylphenylsilyl, (xLi) C₁₋₄ alkylsulfinyl,(xLii) phenylsulfinyl, naphthylsulfinyl, (xLiii) C₁₋₄ alkylsulfonyl,(xLiv) benzenesulfonyl, toluenesulfonyl, (xLv) C₁₋₄ alkoxy-carbonyloxy,(xLvi) halo-C₁₋₄ alkyl, (xLvii) halo-C₁₋₄ alkoxy, halo-C₁₋₄ alkylthio,halo-C₁₋₄ alkylsulfinyl halo-C₁₋₄ alkylsulfonyl, (xLviii) cyano, nitro,hydroxyl, carboxyl, sulfo, phosphono, (xLix) C₁₋₄ alkyloxysulfonyl, (L)phenoxysulfonyl, tolyloxysulfonyl, (Li) C₇₋₁₂ phenylalkyloxysulfonyl and(Lii) di-C₁₋₄ alkyloxyphosphoryl group, or a salt thereof.
 2. A methodaccording to claim 1, whereinX¹ is nitro; X² is a hydrogen atom, C₁₋₂alkoxycarbonyl or C₁₋₂ alkylsulfonylthiocarbamoyl; R¹ is amino, mono- ordi-C₁₋₄ alkylamino, halo-C₁₋₄ alkylamino, N-C₁₋₄ alkyl-N-C₁₋₂alkanoylamino, N-halo-C₁₋₄ alkyl-N-C₁₋₂ alkanoylamino or C₁₋₂alkanoylamino; R² is a hydrogen atom, C₁₋₂ alkoxy, di-C₁₋₂ alkylamino,C₁₋₄ alkyl, halo-C₁₋₄ alkyl or C₁₋₂ alkanoyl; n is an integer equal to 0or 1; and A^(O) is selected from the group consisting of 2- or3-thienyl, 2- or 3-furyl, 2- or 3-pyrrolyl, 2-, 4- or 5-oxazolyl, 3-, 4-or 5-pyrazolyl, 2-, 4- or 5-imidazolyl, 3-, 4- or 5-isoxazolyl, 3-, 4-or 5-isothiazolyl, 3- or 5-(1,2,4-oxadiazolyl), 1,3,4-oxadiazolyl, 3- or5-(1,2,4-thiadiazolyl), 1,3,4-thiadiazolyl, 4- or5-(1,2,3-thiadiazolyl), 1,2,5-thiadiazolyl, 1,2,3-triazolyl,1,2,4-triazolyl, 1H- or 2H-tetrazolyl, N-oxido-2-, 3- or 4-pyridyl, 2-,4- or 5-pyrimidinyl, N-oxido-2-, 4- or 5-pyrimidinyl, 3- or4-pyridazinyl, pyrazinyl, N-oxido-3- or 4-pyridazinyl, benzofuryl,benzothiazolyl, benzoxazolyl, triazinyl, oxotriazinyl,tetrazolo[1,5-b]pyridazinyl, triazolo[4,5b]pyridazinyl, oxoimidazinyl,dioxotriazinyl, pyrrolidinyl, piperidinyl, pyranyl, thiopyranyl,1,4-oxazinyl, morpholinyl, 1,4-thiazinyl, 1,3-thiazinyl, piperazinyl,benzimidazolyl, quinolyl, isoquinolyl, cinnolinyl, phthalazinyl,quinazolinyl, quinoxalinyl, indolizinyl, quinolizinyl,1,8-naphthyridinyl, purinyl, pteridinyl, dibenzofuranyl, carbazolyl,acridinyl, phenanthridinyl, phenazinyl, phenothiazinyl, andphenoxazinyl, any of which can be unsubstituted or substituted withhalogen, C₁₋₄ alkyl, halo-C₁₋₄ alkyl, C₁₋₄ alkoxy, halo-C₁₋₄ alkoxy,C₁₋₄ alkylthio or halo-C₁₋₄ alkylthio.
 3. A method according to claim 1,whereinX¹ is nitro; X² is a hydrogen atom or C₁₋₂alkylsulfonylthiocarbamoyl; R¹ is amino, mono- or di-C₁₋₂ alkylamino,halo-C₁₋₂ alkylamino, N-C₁₋₂ alkyl-N-C₁₋₂ alkanoylamino, N-halo-C₁₋₂alkyl-N-C₁₋₂ alkanoylamino or C₁₋₂ alkanoylamino; R² is a hydrogen atom,C₁₋₂ alkoxy, di-C₁₋₂ alkylamino, C₁₋₄ alkyl, halo-C₁₋₄ alkyl or C₁₋₂alkanoyl; n is 1; and A^(O) is pyrazinyl, which is unsubstituted orsubstituted with halogen, C₁₋₄ alkyl, halo-C₁₋₄ alkyl, C₁₋₄ alkoxy,halo-C₁₋₄ alkoxy, C₁₋₄ alkylthio or halo-C₁₋₄ alkylthio.
 4. The methodaccording to claim 1, whereinX¹ is nitro; X² is a hydrogen atom, C₁₋₄alkoxycarbonyl or C₁₋₄ alkylsulfonylthiocarbamoyl; R² is a hydrogenatom, C₁₋₃ alkanoyl, C₁₋₄ alkyl, mono- or di-C₁₋₄ alkoxy-C₁₋₄ alkyl,C₇₋₉ phenylalkyl, mono- or di-C₁₋₄ alkylamino or C₁₋₄ alkoxy; and A^(O)is pyrazinyl which is unsubstituted or substituted with halogen, C₁₋₄alkyl or C₁₋₄ alkoxy.
 5. The method according to claim 1, whereinX¹ isnitro; X² is a hydrogen atom, C₁₋₄ alkoxycarbonyl or C₁₋₄alkylsulfonylthiocarbamoyl; R¹ is amino, mono- or di-C₁₋₄ alkylamino,N-C₁₋₄ alkyl-N-C₁₋₃ alkanoylamino, C₇₋₉ phenylalkylamino,halogenothiazolyl-C₁₋₂ alkylamino or C₁₋₄ alkoxy-C₁₋₂ alkylamino; R² isa hydrogen atom, C₁₋₃ alkanoyl, C₁₋₄ alkyl, mono- or di-C₁₋₄ alkoxy-C₁₋₄alkyl, C₇₋₉ phenylalkyl, mono- or di-C₁₋₄ alkylamino or C₁₋₄ alkoxy;and, A^(O) is pyrazinyl which is unsubstituted or substituted withhalogen, C₁₋₄ alkyl or C₁₋₄ alkoxy.